Demand Is Desire With Purchasing Power Attached
Tickets priced at $40 vanish in nine minutes; relisted at $400, they sit unsold all week. Same band, same seats — the only thing that changed is how many people are still willing and able to pay.
Demand is the amount buyers are willing and able to purchase at each price over some period. Both halves matter: wanting the tickets isn't demand until the money's prepared to follow.
The law of demand
As price falls, quantity demanded generally rises, and the reverse holds too. A theater might sell 300 seats at $20 and 450 at $15 — the same show finding more buyers at a friendlier number.
Economists call that pattern movement along the demand curve. The product didn't change; the price did, and buyers responded.
How sharply buyers react is the curve's elasticity. A concert with one date can raise prices without losing many fans, while a cereal brand with ten lookalike substitutes loses shoppers over a dime.
Shifts are a different animal
Now a famous actor joins the cast, and the theater sells more seats at both prices. That's a shift in demand — the whole relationship moved, not just a point on it.
Shifts come from income changes, tastes, expectations, population, and the prices of related goods. Pricier train fares push riders toward buses (substitutes), while pricier printers drag down ink sales (complements).
Why the "able" half matters
Desire without money never registers in a market. Rising incomes lift demand for most goods, and broad demand growth is a main engine of economic growth — while squeezed household budgets pull it the other way.
Sellers live on the same curve from the other side. A product people adore at $5 can die at the $12 its costs require, because admiration doesn't ring the register.
Demand never works alone
Prices settle where demand meets supply — what producers will offer at each price. When demand outruns supply across a whole economy, the result shows up as inflation.
The CFPB's youth financial glossary keeps a plain definition of demand and its relatives.
Next time a price jumps, watch what buyers actually do — that reaction is demand talking.