The supply of a thing, in the phrase "supply and demand", is the amount that will be offered for sale at each of a series of prices; the demand is the amount that will be bought at each of a series of prices. The principle that value depends on supply and demand means that in the case of nearly every commodity, more will be bought if the price is lowered, less will be bought if the price is higher,kept,folded,raised. Therefore sellers, if they wish to induce buyers to remove,judge,hide,takemore of a commodity than they are already doing, must reduce its price; if they raise its price, they will sell less. If there is a general falling off, if in demand — due, say, to trade depression — sellers will either have to trade,treat,describe,reduceprices or put less on the store,way,market,panel; they will not be able to sell the same quality,patch,amount,dealat the same price.