| Symbol & Abbreviation | Meaning |
|---|---|
| Δ | Change or Difference (ΔQ means the change in Quantity Demanded from time 1 to time 2 |
| + | Plus, Rise, Goes Up, Increases, Add |
| – | Minus, Fall, Goes Down, Decreases, Subtract |
| QD | Quantity Demanded (The number of products the consumers want and can purchase) |
| QS | Quantity Supplied (The number of products the suppliers have available on the market) |
| P | Profit |
| p | price |
| ± | Plus or Minus. (QS = ±3 means that QS can either go up or down 3 depending on what you changed). |
| X < Y | X is less than Y |
| X > Y | X is more than Y | X is greater than Y |
| X | the Vertical line on a graph |
| Y | the Horizontal line on a graph |
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