Which factor contribute to an outward shift of production possibilities frontrerin in the long run

A. Decrease in the working population
B. Deduction in training programmes
C. Decrease in investment in capital goods
D. Increase in efficiency of resource management

D. Increase in efficiency of resource management

Efficiency of resource management can lead to increased productivity and output, allowing an economy to produce more goods and services with the same level of resources. This can result in an outward shift of the production possibilities frontier in the long run.