Why isn’t price a factor in influencing a left or right shift in the demand curve

Changes in production cost and related factors can cause an entire supply curve to shift right or left. This causes a higher or lower quantity to be supplied at a given price. A demand curve or a supply curve is a relationship between two, and only two, variables: quantity on the horizontal axis and price on the vertical axis. The assumption behind a demand curve or a supply curve is that no relevant economic factors, other than the product’s price, are changing.

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a: social security and social programs

the money supply is the total amount of money available in the economy. how do changes in the money supply affect people and businesses?