Differences in human capital $($for example, educationeducation$)$ lead to differences in individual earnings. According to a recent Current Population Survey, the median usual weekly earnings of $25-$and$-$over workers with only high school diplomas were $$Press Space to openapproximately halfhigherlowerwealthabout $1$DOLLAR$11000$ less thanmore than double the earnings of a worker with a Master$$s degree. The $$Press Space to openapproximately halfhigherlowerwealthabout $2$DOLLAR$21000$ less thanmore than double marginal product of workers that have invested heavily in their own human capital helps to create high demand for their skills