Last year, labour market economist John Philpott found that more than one in five workers, around 7.1 million people, were in precarious employment, up from 5.3 million in 2006. Money supply is determined by the central bank of exogenous variables, the demand for money depends on the liquidity preference of people, when people's liquidity preference to enhance tend to increase the money hold, so rates are determined by the liquidity preference in joint decision currency demand and currency supply; Loanable ZiJinLun combines the first two interest rate determinism, that interest rate is determined by the supply and demand of loanable funds, including the total savings and new bank money supply and demand including the total investment and new currency demand, interest rate decision depends on common commodity market and money market equilibrium Canning's 1929 book, economics in accounting, cites the economist's view that asset values are determined by the present value of the future cash flows of assets. Stopping trading is an important part of the plan.