Buyer (bid height)
Seller (ask height)
Just traded
Equilibrium plane P*
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Rather than plotting two curves on a flat chart, this scene populates a market with individual buyer and seller agents, each holding a private valuation implied by the same linear demand and supply parameters. Every round, unmatched buyers raise their bid and unmatched sellers lower their ask a little toward their own true value; the instant a bid meets or exceeds an ask, the pair trades and settles onto the equilibrium price plane. Watching dozens of agents converge from scattered heights onto a single flat plane makes the abstract idea of "the market finds its price" into something you can literally see happen, trade by trade — and tuning the tax or subsidy slider shows how a policy wedge changes both the resting height of that plane and how many agents ever manage to trade at all.