In my store, when I lower the price of a cold drink and sell more, that's like your movement along the curve—same demand, just a price change. But when the monsoon comes and suddenly everyone wants my bottled water instead of Coca-Cola, that's a shift—the whole curve moves because tastes changed. Here, the obvious answer forgets that a shift isn't always about big trends; sometimes it's just the old tiles leaking and a tourist needing a cheap umbrella. The curve shifts for small, wet reasons too.
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