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a change in demand is a movement along the demand curve, and a change in quantity demanded is a shift in the demand curve. 3 people found this useful. Edit. Share to: 1  The Job Outlook and Salary Trends for a Cosmetologist Cosmetology is a field with many different opportunities for its professionals.
Demand refers to an individual's willingness to pay a particular price for an item or stock. The spread is the difference between the bid and asking prices for a particular security. The size of the spread and price of the stock are determined by supply and demand. The more individual investors or companies that want to buy, the more bids there will be; more sellers results in more offers or asks.