This document discusses how supply and demand impact the value of workers' skills and the prices of goods and services. It explains that workers who invest in developing their own human capital through increased knowledge and skills will become more productive and valuable to employers. The demand for workers is derived from the demand for the goods and services they produce, so when demand increases or decreases for a particular good or service, the demand for the workers who make it does as well. The document also outlines how supply and demand impact prices, with prices generally rising when demand increases or supply decreases, and falling when demand decreases or supply increases.