Hoarding is when someone collects and keeps too much stuff, often to the point where it's hard for them or others to move around. Think of a messy attic with boxes piled up everywhere.
The word "hoarding" can have different meanings depending on how you use it. If someone is hoarding, they're collecting things and not letting anyone else use them. But if something is being hoarded by a company or an industry, it means they're buying up all the available supplies of a product so they have complete control over its price and availability. This can be seen as unfair to consumers who then have no choice but to pay higher prices.
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