# Posts by economyst

Total # Posts: 1,117

**mathematics**

Drawing a picture helps. In a 3x3 side of a cube there is 1 interior square, all the rest are edge pieces. Since there are 6 sides to a cube y for a 3x3 = 6 In a 4x4 there are 4 interior squares. In a 5x5 there are 9 interior squares. In a 6x6 there are 16 interior squares. ...

**Probability**

An excel spreadsheet is very helpful for these kinds of problems. First calculate the probabilities for all possible outcomes. There are two kinds of people with and without cancer, the first test can have two outcomes positive and negative, and the second test has two ...

**Probability**

An excel spreadsheet is very helpful for these kinds of problems. First calculate the probabilities for all possible outcomes. There are two kinds of people with and without cancer, the first test can have two outcomes positive and negative, and the second test has two ...

**economics**

There are plenty of federal law enforcement agencies which are not a part of homeland security. Topping the list are FBI and CIA.

**economics**

I have actually seen someone postulate an untestable economic model. It was untestable because one of the exogenous variables was unmeasurable. (And so, it was a ridiculus model). The model was something like peace in the middle east was a function of the number of people, ...

**Economics International Trade**

Do a little research and then take a shot. What do you think? Hint: these questions are all about opportunity cost; examine the opportunity cost of producing C and F in by both skilled and unskilled labor.

**Probability**

a) correct b) four unrelated people standing in a row. Probability that they are in this exact order: A, B, AB, O is .37*.125*.035*.47 = .0007608 Now then, the number of ways these four people can be re-arranged is 4*3*2*1 = 24. So, Probability is 24*.0007608 = .01826

**probability**

I think I understand your question. The mod(x,z) function says divide x by z and give the remainder. (does remainder mean "residue" in your question?) So, mod(1789,4) is 447 and 1 remainder. mod(1789,10) is 178 and 9 remainder. mod(1789,101) is 17 and 72 remainder.

**weonomics**

take a shot, what do you think? hint: drawing a graph will help, put Price on the y-axis, Q on the x-axis. and plot Qs and Qd. Equilibrium occurs when Qs=Qd for a given price.

**Advanced Economics**

Again, I am having trouble understanding your questions. We can see numerous testable events to see if a dis-equilibrium situation is able to resolve itself and make progress towards an equilibuium outcome. For example if we see Qs>Qd (e.g. an oversupply of office space). ...

**Advanced Economics(resoponses to economyst to my q**

Im having trouble understanding your question. That said: 1) if AC is rising, MC must also be rising -- by definition. Further, I cannot think of a circumstance where there is dis-economies of scale and MC not rising. But I can think of reasons why MC could rise while P ...

**stat math**

Calculate the standard deviation. SD = sqrt(p*q/n) = sqrt(.62*.38/100) = .0485. 95% confidence interval (use alpha=1.96) -- ranges between .62+.0485*1.96 and .62-.0485*1.96 Repeat for females.

**Advanced Economics**

I am struggling to understand your questions. In 1) are you asking why short-run adjustments to labor supply (and demand) are less senstive to long-run adjustments? If so, there are a plentitude of reasons. In the SR, firms must draw from workers local to the firm. In the LR, ...

**Econ**

good question. While I'm not positive, I believe holding foreign assets increases a bank's reserves. (It certainly increases its foreign reserves). check this site: http://www.answers.com/topic/foreign-exchange-reserves

**Macroeconomics**

how can the mpc be greater than one??? Unless you can cook up some incredible scenario, its not in the realm of possible.

**Macroeconomics**

yes

**Macroeconomics**

y912f's formula is certainly one form of depreciation. The formula is really a simple decay function, where, starting at value P, the value of something goes down by R% per time period. There are many ways to calculate "depreciation" depending on the context and ...

**economics**

From the information, you have given, Price will be $10. If demand increase an prices rises above $10 in the short run, more firms will enter and drive the price back down to $10. If demand falls and and price falls below $10, all firms will begin to lose money in the short ...

**Macroeconomics: GDP**

1) I believe you are correct, the mini is both consumption C and an import M. In the GDP measure they cancel each other out, so the purchase does not change GDP. 2) I too am confused by the question. Sorry.

**Economics**

You could work this problem in one of two ways. You could convert all of the nominal dollar values your are given and convert them into 1984 dollars (CPI in 1984 = 100). Or you express the 1965 nominal dollar in real 1962 dollars by dividing by the change in CPI from 62 to 65...

**Engineering Economics**

An excel spreadsheet is very helpful for these types of problems. Let's first assume that both deposits and withdrawls are made at the end of the year. (Deposits at the beginning of the year slightly change the answer, but not the methodology). So B1 (balance at the end of...

**puzzle (math, psychology)**

Its just logic. Plus it helps if you have seen the problem before.

**puzzle (math, psychology)**

1) fill C from A -- A=5, B=0, C=3 2) fill B from C -- A=5, B=3, C=0 3) fill C from A -- A=2, B=3, C=3 4) fill B from C -- A=2, B=5, C=1 5) fill A from B -- A=7, B=0, C=1 6) fill B from C -- A=7, B=1, C=0 7) fill C from A -- A=4, B=1, C=3 8) fill B from C -- A=4, B=4, C=0 tada

**microeconomics**

An Excel spreadsheet is very helpful for these kinds of problems. Always always always, maximize where MC=MR. So calculate marginal cost and marginal revenue schedules. Going from 0 to 1 unit, costs went from 8 to 9, so MC here is 1. (Take the hint and MC at 1/2 is 1). Going ...

**Economics**

An Excel spreadsheet is very helpful for these types of calculations. (in thousands for brevity): PV = 1000 + 800/(1.08) + 800/1.08)^2 + 800/(1.08)^3 + .... 1000/(1.08)^10

**ECON**

see my post to your earlier post.

**Probability**

Nevermind, I get it. P(x) = 5/10 for 0<= x < 1 = 1/10 for 1<= x < 2 = 2/10 for 2<= x < 3 = 1/10 for 3<= x < 3.5 = 1/10 for 3.5<= x P(x>1.5) = 5/10

**Probability**

I'm confused. I think to answer this question, we need to know the range of your variable a. Does a go from -infinity to +3.5?

**Economics**

In your problem: total fixed costs (TFC) are 120,000 total variable costs (TVC) are 4000*(25+2+1) = 112,000 Total costs are 120,000+112,000=232,000 Average costs are 232,000/4000 = 58. Marginal costs are the cost of producing one more book = 25+2+1 = 28. Ok, now repeat for the...

**ECONOMICS**

Your slope of -2 of the budget constraint is because Py/Px = 2. To maximize, Fred will want (MUy/MUx) = Py/Px. So, first find marginal utilities. For MUx take the first derivative with respect to X. MUx = (1/2)*X^(-1/2)*Y^(1/2) MUy = (1/2)*X^(1/2)*Y^(-1/2) So, MUy/MYx ...

**Probability**

A poisson distribution follows the formula: (e^(-x) * x^k)/k! where x is the expected mean and k is the number of "true" events. You are given that the mean number of sales of tables is 5 (x=5) and you are asked for the probability that exactly 5 tables are sold (k=5...

**microeconomics**

Utility is relative measure of happiness/pleasure/satisfaction. See http://en.wikipedia.org/wiki/Utility If consuming good A gives a person more utility than good B, then that person would pay more for A than B.

**economics**

In general, a change in price for good X is a movement along a supply or demand curve of good X. However a change in the price of X could shift the demand for good Y.

**econ**

In a two-good world, the PPC shows the various maximum amounts of the two goods assuming the economy is producing efficiently. So, an increase in efficiency would shift the curve outward.

**econ**

The economy would be producing at a point, any point, inside the curve

**Managerial Economics**

Take a shot, what do you think. Hint: you have a price-discriminating monopolist. First determine the Marginal revenue equations for each market. Marginal Cost is zero in both. So, allocate the marginal car to the market where MR is highest. Since the two demand curves have ...

**math**

how bout 9+6-5=7+3

**math**

what is your question?

**Math**

I takes a minute hand 60 minutes to go 360 degrees or 6 degrees per minute. It takes an hour hand 12*60=720 minutes to go 360 degrees or .5 per minute. At 7:30, the minute hand is pointing exactly on the 6 and the hour hand is half-way between the 7 and the 8; an angle of 45 ...

**math**

Just plug in the values of the ordered pair to see which one is false. For 1) 4>(2*1 + 1) --- true for 2) 8>(2*3 + 1) --- true continue for 3 and 4 and you will have your answer

**Math: Present Value**

Quarterly: For an initial balance B, you want B*(1+.07/4)^20 = 9000. (1+.07/4)^20 = 1.0175^20 = 1.414778 And 9000./1.414778 = 6361.42 QED Continuously, you want B*e^(.07*5) = 9000. e^(.35) = 1.4190675 -- take it from here.

**Finance 200**

Excel spreadsheets are very helpful for these types of problems. 225*(1+r)^11 = 1000. solve for r (1+r)^11 = 1000/225 = 4.444 Raise 4.444 to the (1/11) power I get r=.145

**Math**

Cut-and-paste operations do not work so well on Jiskha posts. You may need to type out each of your current solutions.

**Math (Probability)**

I don't think the spinner is possible given the requirements you provided. The largest number in two spins is 1 so, one section must have a value of 1/2 (or 6/12) The most likely value for two spins is 5/6 so, the largest area must have a value of 5/12. Which means the ...

**IT 221**

I'd say, "no problem, we can amend the work order." Then I would give the customer a new delivery date and a new cost estimate. Changes in work orders, are, for many many firms, the high-profit work of the firm. First and foremost, the changes in work-order are (...

**math-statistics**

Ok, I'm a little lost in your answer. I would say: H0:p=.02, Ha:p>.02 The expected mean number of damages is p*n = .02*60 = 1.2 The formula for the standard deviation for a binominal distribution is sqrt(n*p*q) (where q=1-p) so, sd = sqrt(60*.02*.98) = 1.0844 the alpha ...

**College Lookup?**

here is something from Collegeboard -- http://collegesearch.collegeboard.com/search/adv_typeofschool.jsp

**statistics**

for 3., 4., and 5. The data is already sorted, lowest-to-highest. The data set contains 15 elements. 35% of 15 is 5.25 (So, I would use the value of the 5th element) 25% of 15 is 3.75 (So, I would use the value of the 13th element) For 11, 12, and 13 again use the sorted set. ...

**economics**

I am not aware of any "rule of 30" that pertains to economics. However a "statistical" rule of 30 says, effectively, that one shouldnt make statistical inferences on samples of less than thirty.

**Macroeconomics**

Do a little research, then take a shot. What do you think? Hint: draw IS and LM curves. What would the IS curve look (or how would it shift) if G was inversely related to r.)

**Math 115...Help am really lost**

You method is as reasonable as any. If you had more observations, I would suggest some form of regression equation. However, 6 data points does not warrent such extravance.

**economics**

Take a shot, what do you think. Hint: could you buy a house without a loan?

**Microeconomics**

At equilibrium, Qd=Qs. So, 400-15P = 50+15P. Use algebra and solve for P.

**Economics**

In production, the law of diminishing returns tells us that the opportunity cost of producing another unit of something keeps increasing as more and more of that item is produced. The answer to both is that the opportunity costs increase. Check out this site for more insights...

**macroeconomics**

Do a little research, then take a shot. Hints 1) interest rates and investments move is opposite directions. 2)http://en.wikipedia.org/wiki/Phillips_curve 3) 10% of 4000 is 400. 4) Nominal interest rate is equal to the real rate plus inflation.

**Economics**

I'm not sure I understand your question. From a pure market-economist's point of view, price floors and ceilings are abominations. If binding, they only create shortages or surpluses. Of course, there are many non-economic (e.g., social) reasons for having floors or ...

**‚r‚”‚‚”‚‰‚“‚”‚‰‚ƒ‚“**

(I wonder how I got that strange looking title to my first response???)

**‚r‚”‚‚”‚‰‚“‚”‚‰‚ƒ‚“**

What you have here is a "Distribution of Linear Combinations" problem. Lets start with the expected mean of Xi. There is a 1/6 prob of rolling either a 1,2,..6. So mean of X1 is (1/6)*(1+2+3+4+5+6) = 3.5. Since all the dice are the same, mean X1= mean X2 = mean X3 = ...

**STATISTICS**

See my post to MAI on tuesday, December 16.

**economic**

The concentration ratio is usually thought of as the percent of an industry (i.e., market share) made up of the top 4 (sometimes 5) firms in the industry. If 4/20 = 20% of the firms make up 20% of the industry, then the all firms in the industry must be very close in size and ...

**Economy**

GDP = C+I+G = aggregate expenditures or total income. And total income can either be spent on consumption (C), saved (S), or used pay taxes (T). So GDP=C+S+T SO C+I+G = C+S+T Assuming a balanced budget, T=G. And by definition C=C. So, S=I, go with answer B.

**managerial economics**

Given the information, you have give, the price elasticity is highly elastic. This suggest you should lower the price. While you provide total variable costs, you have not provided marginal costs. So, the profit maximizing price cannot be determined.

**economics**

I'm guessing that you tried to cut-and-paste the "information". As you found out, such efforts do not work well on the jiskha site. That said, always always always maximize profit where marginal cost = marginal revenue.

**Economics**

Reasons abound. I will give you 3 to get you started. Obvious reason #1) If government spends more without taxing more, it must borrow the funds. An increase in demand for loanable funds raises interest rates, which in turn, lowers private investment. This is referred to as &...

**math (patterns)**

One pattern that I see is the number of letters in the toy name. The pattern is not absolutely linear. But regardless, the more expensive the toy the longer the name.

**Microeconomics [Urgent!]**

40) I agree 47) I agree (but tricky as market is not in equilibrium) 07) I agree 30) production information is missing.

**managerial economics**

Take a shot, what do you think? Hint: What information does the firm in the perfect competitive market need to determine it's profit maximizing price? Compare that to the information needed to determine the optimum price in a monopoly.

**managerial economics**

Do a little research, then take a shot. what do you think?

**stats: need help please**

In the simple KENO game where one number is played. a) There is a 25% chance of winning $3 and a 75% chance of winning zero. b) the mean payoff is .25*3 + .75*0. = 0.75 or 75 cents on each dollar bet. c) from b, the casino keeps 25 cents on each dollar bet.

**Economics: Comperative Advantage**

If Paul spends all of his time on W he produces 8 bushels, if all his time on C he produces 10. Since, as given, he spends equal amounts of time, he must be producing 4 W and 5 C. For a total of 9 bushels. Repeat for Cliff. He must initiall be producing 3 W and 2 C, for a ...

**Macroeconomics**

Do you have a question? Or is your task to evaluate the arguments made using an IS/LM framework. If so, do a little research, then take a shot. I or others will be glad to critique your answer.

**Macroeconomics**

Do a little research, then take a shot. What do you think?

**Economics**

Some clarifying questions first. 1) Am I to assume the entire economy consists of CDs and Tennis Racquets? I presume yes. 2) Is the Tennis Racquets production in 2006 really 90 -- should it be 190? I will assume 190. 3) You are asked to calculate a price index. There are 2 ...

**Microeconomics: Consumer Theory**

MU in consumption is (almost always) postive but declining. Make a graph, put MUz on the y-axis, put consumption of good z on the x-axis. You should graph a downward sloping relationship, but MU is always positive. That is, each additional unit (bite) of good z adds to total ...

**economic**

Do a little research, then take a shot. What do you think? Hint for 1): find the government spending multiplier: (1/MPS) Hint for 2): find the taxation multiplier: (1/MPS)-1.

**Principles of microeconomics**

Dont get confused by character of corporate equities (stocks). This is a simple supply and demand graph. Draw a simple supply and demand curves for stocks find equilibriums for price (Po) and quantity (Qo). Total spending is Po*Qo. Now shift the supply curve inward, reflecting...

**Finance**

follow the formula for calculating yield to maturity. See: http://www.moneychimp.com/articles/finworks/fmbondytm.htm

**economics**

The liquidity preference theory (hypothesis) comes from Keynes. See, for example, http://www.answers.com/topic/liquidity-preference-theory I too think d is the correct answer.

**Economics**

I don't understand how you answer addresses the original question(s) An industry with 20 firms and a CR of 20% means that all firms are exactly the same size. Which implies that the industry is highly competitive and there is no improvement from economies of scale. An ...

**Economics**

Do a little research, then take a shot. What do you think?

**Statistics**

sorry, yes it has a mean of zero

**Statistics**

Its not an either/or answer. Yes, the t distribution has a mean of years. and Yes, it is a continuous distribution in the sense that the tails of the distribution go on to infinity (or neg. infinity)

**College - Microeconomics - help**

09) I agree. 18) I agree. 23) I agree. 24) I agree. 30) I agree. 31) I agree. 38) You did not answer. Draw initial supply+demand curves for grapefruit. Now increase demand. Producer surplus is the area above the supply line but below price -- how does this area change? 42) I ...

**Microeconomics (need to see if i got these right.**

Generally well done. I agree with most of your answers, disagree with some, and some I'm not to sure about. 31-35 I agree 36) elasticity of supply is (%change in Qs) / (%change in P). If this is less than 1, supply is inelastic. 37-40 I agree. (I presume that total surplus...

**ECONOMICS**

Take a shot. what do you think?

**Microeconomics (trying this question again)**

11-20 I agreee 21) If the price of a commodity increases -- this is a movement along the supply or demand curves -- a change in quantity suplied. If price goes up, quantity supplied goes up. 22) You did not answer. draw an initial supply and demand graph. Find a price where Qd...

**Microecomonics (need to see if i got these right**

1) I agree 2) Economics studies how LIMITED resources are used to satisfy UNLIMITED wants. Given that this isnt one of your choices, I would go with c) to study the choices people make. 3) I would go with c) we make choices because of scarcity; we cant have everything we want...

**Economics**

Take a shot, what do you think? Hint: if a firm's revenue is greater than its variable costs, but less than its total costs, it should stay in business in the short run.

**Economics**

Price elasticity is the percentage change in price divided by the percentage change in quantity. %change in P = 100*(.50/3.50) =14.29 %change in Q = 100*(-10/30) = -33.33 Elasticity therefore is -33.33/14.29 = -2.33 Since elasticity is > 1 (absolute value) it is elastic. (...

**Economics**

Ok, the firm's total daily revenue is 30*300,000 = 9,000,000. The firms total daily VARIABLE costs are 100*70,000 + 500,000 = 7,500,000. So revenue less costs is 9,000,000-7,500,000 = 1,500,000 Now then, you are given that you don't know the level of fixed costs, ...

**Economics**

What I don't see is a question. What are you having trouble with? What do you think the answer is?

**mircoeconomic**

Ok first timer Lisa. We, the homework help providers, generally like to see some effort on the part of the student. We are not here to do your homework, but to guide your thinking. But since you asked. Optimal consumption will occur when MUx/MUy = Px/Py (where x and y are ...

**MacroEconomics**

Do a little research, then take a shot. What do you think. Hint: think about kinds of government policies that, on the surface, are countercyclical fiscal policies. Then think about how those policies are paid for. Does the cost outweight the benefit?

**Mathematics**

An excel spreadsheet is very helpful for these kinds of calculations.

**probability**

Ok, first choose the roll that is NOT a 4. There are 4 possibilities. The probability of rolling NOT a 4 is 5/6. The prob of rolling a 4 is 1/6. So, the prob with 4 roll of rolling three 4's is: 4*(5/6) * (1/6)^3

**math**

Assuming there is no change in productivity.. In one hour, Thomas does 1/4=25% of the job, while Julia does 1/6=16.66%. Combined they would do 25%+16.66% = 41.66% of the job in 1 hour. So, 1/.4166= 2.4 hours

**taxes please help**

I get a refund of -1042. Over the course of a year, she will have 26 pay periods, so, she will withhold 260*26 = 6760. Her final final liability is 6240+235-374-563 = 5718. So she is due a refund of 6760-5718 = 1042

**ecomonics**

Find where supply=demand -- from your table at price=8 Qd=16000 and Qs=16000. tada. from you equation set Qd=Qs or 20000-500P = 8000+3000P. Solve for P (use algebra) (hint: I get P=8) tada again, that's all there is to it.

**International Trade**

I think on this question, Google is your friend. Start here: http://en.wikipedia.org/wiki/Immiserizing_growth (Broken Link Removed)

**International Trade**

I don't have a copy of Krugman and Obstfeld. And I obviously don't have the math and graphs you developed in your class. So, what do you want of the Jiskha help site?