The supply of goods or services in a market is the amount that producers are willing to put on the market for sale. It is not necessarily the total stock of goods, as sometimes producers hold back for various reasons (eg. to influence the price, or in anticipation of higher future prices).
The supply curve is upward sloping, as there is a direct relationship between the price and the amount supplied. Ceteris paribus, if price goes up, supply goes up.
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