If two regressions use different sets of observations, then we can tell how the R-squareds will compare, even if one regression uses a subset of regressors.?

In the 1970s and 1980s policies that required retirement of people over age 65 were repealed. Which variable would this directly affect?

a. The employment-population ratio b. Productivity c. Average hours d. Population e. Technology

The law of increasing costs states that the opportunity cost of producing a good increases as more of the good is produced

Indicate whether the statement is true or false