Consider the following statements:1. Bond prices and interest rates vary directly.2. 'Supply creates its own demand' is known as Walra's Law.3. The rate that equalizes the discounted cash flow expected from an investment in a capital asset to its supply price is the marginal efficiency of investment.4. Disposable income varies inversely with a tax on personal income. Which of the above statements are correct?

Macroeconomics is a branch of economics that studies how an overall economy—the market or other systems that operate on a large scale—behaves.