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The demand and supply schedules rest on the assumption that all other influences on supply and demand remain the same as we move up and down the possible price values. We use the expression other things being equal, or its Latin counterpart ceteris paribus, to describe this constancy of other influences. For example, we assume on the demand side that the prices of other goods remain constant, that tastes and incomes are unchanging, that the size of the market is given, and so forth. On the supply side we assume, for example, that there is no technological change in production methods.
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