why was The highest social class of early civilizations held by merchants and skilled workers

i have the answer thank u

who what answers?

They were most necessary for civilization. People needed the goods they couldn't produce at home.

Does your text have more information?

no that is it thank u

You're welcome.

another question actually

Which development directly allowed for the keeping of records?

Explain

The invention of writing?

Do you have other choices?

no it is a explanation question

the answer is systems of writing but i need an explanation