Human capital refers to the stock of productive skills and technical knowledge embodied in labor. Many early economic theories refer to it simply as labor, one of three factors of production, and consider it to be a fungible resource -- homogeneous and easily interchangeable. Other conceptions of labor dispense with these assumptions.

Economic growth

Economic growth is the increase in value of the goods and services produced by an economy. It is conventionally measured as the percent rate of increase in real gross domestic product, or GDP. Growth is usually calculated in real terms, i.e. inflation-adjusted terms, in order to net out the effect of inflation on the price of the goods and services produced. In economics, "economic growth" or "economic growth theory" typically refers to growth of potential output, i.e., production at "full employment," which is caused by growth in aggregate demand or observed output.
As economic growth is measured as the annual percent change of gross domestic product (GDP), it has all the advantages and drawbacks of that measure.