To make it easier for companies to pay back their bank loans or stock issues, the financial sector defends tax benefits for these major customers, recognizing that whatever the tax collector leaves behind can come back to the banks in the form of interest payments on further loans. (michael-hudson.com)
They assume that an investor makes an initial investment and then holds on for the period in question while any income generated by the investment (usually in the form of interest payments or dividends) is reinvested. (moneysense.ca)
This income could be in the form of interest payments, stock dividends or capital gains (when you sell a security for more than you paid for it). (abcsofinvesting.net)