Can you help me by explain the problems...

I am trying to understand the chapters for Macroeconomics class practice.

MEASURING OUTPUT AND EMPLOYMENT (Ch. 4)

1. Gross domestic product {GDP} is the typical way of mea- suring the value of national output. Real GDP adjusts GDP for changes in the price level. 2. GDP can be calculated in three ways: the nal goods approach1 which adds the value of all Fmal goods produced in the economy in a given year; the value-added aPPWEEhr Wlch adds the difference between rms' revenues and costs of mtermediate goods; and the income approach1 which adds together all income received by those in the economy. All three methods give the same answer. 3. Aggregate output in the economy is equal to aggregate income. 4. Economists distinguish between owssuch as output per arand stockssuch as the total value of buildings and machines in an economy at a given time {the capital stock}. 5. Unemployment imposes costs both on individuals and on society as a whole, which loses what the unemployed workers could have contributed and must supply what is needed to support them in other ways. - _.l....... 1. Macroeconomic equilibrium focuses on equilibrium levels of aggregates: employment, output, saving, and investment. 2. The real wage equates the demand for labor with the supply of labor. Increases in labor supply at each real wage are reflected in lower real wages, which induce firms to create additional jobs to match the increases in supply