To invest is to allocate money in the expectation of some benefit in the future. In finance, the benefit from an investment is called a return. The return may consist of a gain (or loss) realised from the sale of property or an investment, unrealised capital appreciation (or depreciation), or investment income such as dividends, interest, rental income etc., or a combination of capital gain and income. The return may also include currency gains or losses due to changes in foreign currency exchange rates. Investors generally expect higher returns from riskier investments. When we make a low risk investment, the return is also generally low. Investors, particularly novices, are often advised to adopt a particular investment strategy and diversify their portfolio. Diversification has the statistical effect of reducing overall risk.