There are, however, three other considerations to bear in mind when trying to compare housing with other forms of capital asset. The first is depreciation. Stocks do not wear out and require new roofs; houses do. The second is liquidity. As assets, houses are a great deal more expensive to convert into cash than stocks. The third is volatility. Housing markets since the Second World War have been far less volatile than stock markets (not least because of the transactions costs associated with the real estate market).