Answer:
a. The production possibility curve(PPC) moves up and to the right because of increase in human skills resulting in enhanced production and output.
b. Due to bumper crop PPC moves up and to the right.
c. Due ton increased workers entering into the country PPC moves up and to the right ( increased output)
d. The workers are already unemployed hence it does not shifts PPC
e. Due to efficiency to convert salt water into fresh water output increases. PPC moves up and to the right.
f. Decreased productive capacity results in PPC shifting down and to the left.