Evaluate the following statements as TRUE or FALSE and then explain your answer:

a. If the study of carpentry becomes more difficult due to complex technological innovations and usage of sophisticated tools, the marginal benefit of achievement will decline.

b. Generally rising expenditure per student are associated with increase in educational achievement.

c. Introduction of school vouchers would increase school choice by parents.

d. Frictional unemployment is inevitable no matter how government work hard to reduce it.

e. Minimum-wage laws are the major explanation for structural unemployment for college graduates than to teenagers.