Change in Demand vs Change in Quantity Demanded- Key Concept

Main ideas / lesson

• The video explains a key distinction in economics:
  • Change in demand ≠ change in quantity demanded
• These concepts can look similar on a graph, but they represent different causes:
  • Quantity demanded changes when price changes.
  • Demand changes when something other than price changes.

Graph explanation (using a burrito example)

• A downward-sloping demand curve shows an inverse relationship between price and quantity demanded.
• The video describes two ways to go from 10 to 20 units, starting at point A:

1. A → C (movement along the curve)

   • This is a change in quantity demanded.
   • The only variable that affects quantity demanded is price.
   • Example given: price falls from 5 to 3, so quantity demanded increases from 10 to 20.

2. A → B (shift of the entire curve)

   • This is a change in demand.
   • Triggered by factors other than price.
   • The curve shifts because demand increases at the same price (the video describes it like: “at Price five… people want even more…”).

What causes each one (core rules)

• Change in Quantity Demanded

  • Cause: Change in price only
  • Graph meaning: Move along the demand curve (e.g., A → C)
  • Direction in this example: Lower price → higher quantity demanded

• Change in Demand

  • Cause: A non-price factor (one of the demand “shifters”)
  • Graph meaning: Shift the demand curve (e.g., A → B)
  • Note: Price itself does not shift the curve; it’s the reference point for the new quantity demanded after the shift.

Non-price factors that shift demand (the “five shifters”)

The video lists examples of factors that can shift demand:

• Change in the price of a related good
• Change in taste and preferences
• Change in income

Speakers / sources featured (as mentioned in subtitles)

• No specific individual speaker name is provided in the subtitles beyond “hey how you doing Eon students” (implying a single instructor/creator).
• Speaker: An unspecified instructor/YouTube creator (“Eon students…”)