Shift or Slide?

The grape market at Abraham & Sara's vineyard

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Demand Supply Point sliding along a curve
Quantity of grapes (crates / week) Price per crate ($) D S D' S'
Simplified linear model, one shock resolved at a time. Curves are straight lines for clarity — real supply and demand curves are rarely perfectly linear, and real markets rarely settle instantly. Direction and which-curve reasoning is the point here, not the exact numbers.