Say that a technological change doubles an economy’s ability to produce good X and triples the economy’s ability to produce good Y. As a result,

a. the economy will tend to produce less X and more Y than before.

b. the opportunity cost of producing units of Y in terms of X forgone will tend to fall.

c. the production possibilities curve will shift out further along the X-axis than along the Y-axis.

d. both b and c would be true.