A balance sheet is simply the enumeration of the various assets of a business on one side of a ledger and the enumeration of various liabilities and (61) accounts on the other side. The two sides must be equal, or balance. Only one further point should be (62) : A balance sheet refers to a single point in time, for example, the close of business on December 31. Taken by itself, a balance sheet does not show (63) over time. It is what economists call a stock concept, not a (64) concept. That is, the balance sheet shows the stock of goods a firm has on hand at any particular instant and does not show the flow of goods through the firm over time. For this reason, a balance sheet does not show business (65) , which are a flow. (46)