According to the economic story, you're free to enter and exit the world of markets as you please. As a buyer, you're free to choose whether to buy something or not. If you want something and can afford to pay for it, it's yours. If nothing pleases you, you can "vote with your dollar" and buy nothing. In practice, if you're less mobile than others in the world of markets somehow, perhaps because you're a child or a senior, or are poor, or have learning disabilities or mental health issues, you don't have the same access to the market as others do who are more independent Instead, you'll likely find it hard to identify your choices and make the best choice, which you need to be able to do for the market to operate efficiently, or you may not have enough money to enter the market to begin with. Sometimes your "best choice" isn't much of a choice at all; if your two options are to starve or to buy bread at extortion rates from the only seller in town, your "freedom" to enter or exit the market doesn't amount to much.
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