Sources of inequality among the bottom 99% of earners The increase in the college earnings premium for the median 2-earner household over the same time period is.. (a) roughly the same size as the previous answer. (b) roughly four times smaller than the previous answer. (c) roughly four times larger than the previous answer. Since 1985, the college earnings premium has (a) decreased substantially, (b) staid roughly constant. (c) increased substantially, (d) moved in a drastic U-shaped pattern. Which best describes the phenomenon of Skill-Biased Technical Change (SBTC)? (a) Firm technologies have changed so that the relative demand for high skill workers has decreased. (b) Firm technologies have changed so that the relative demand for high skill workers has increased. (C) Labor markets have changed, and low-skill workers receive less institutional protection than before. (d) Labor markets have changed, and low-skill workers receive more institutional protection than before