Investing in property (sometimes called real estate) is seen as attractive because it offers investors a risk-return profile that sits between the safety (but comparatively low-yield) of bonds and the volatility (but high return potential) of shares. It also has two sources of return – capital appreciation and income, and while property prices and inflation have not always moved hand-in-hand, it is also seen as offering some protection against inflation. Pension schemes most commonly invest in commercial property, such as an office or a supermarket, rather than in a block of flats, for instance.