Plenty of online marketplaces exist to sell web design, writing, and other common skills. But one marketplace in particular, People Per Hour, allows you to sell a well defined service. For instance, if you studied interior design, you could set a fixed price to design someone’s studio apartment. The marketplace is great and allows you to be more creative with what you can offer based on your actual background.
Residual income is the amount of net income generated in excess of the minimum rate of return. Residual income concepts have been used in a number of contexts, including as a measurement of internal corporate performance whereby a company's management team evaluates the return generated relative to the company's minimum required return. Alternatively, in personal finance, residual income is the level of income that an individual has after the deduction of all personal debts and expenses have been paid.