To avoid running out of money because expenses occur before the money actually arrives (known as a cash flow problem in business jargon) a "safety cushion" of excess cash (to cover those months when actual income is below estimations) should be established. There is no easy way to develop a safety cushion, so families frequently have to spend less than they earn until they have accumulated a cushion. This can be a challenging task particularly when starting during a low spot in the earning cycle, although this is how most budgets begin. In general, households that start out with expenses that are 5% or 10% below their average income should slowly develop a cushion of savings that can be accessed when earnings are below average. Whether this rate of building a cushion is fast enough for a given financial situation depends on how variable income is, and whether the budgeting process starts at a high or low point during the earnings cycles.