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Don't look for a catch - zero-interest loans are actually issued, the company just makes money differently. A bank or store can run profitably through origination fees, insurance they push on you, or they're just betting that some customers will break the terms and pay penalties. For the lenders themselves, it's often a way to attract buyers - it sounds appealing, and they still make real money. Just remember: if you don't pay back the full amount by the end of the interest-free period, they'll charge interest retroactively or even freeze your entire debt.
The main thing is always read the contract before you sign it, because the bank doesn't get its money out of thin air - they'll take it from your pocket some other way.
Yeah, interest-free loans do exist and they work. But instead of interest, the store or finance company makes money through hidden fees: an application commission, mandatory insurance (that you didn't even ask for), penalties for early repayment - all of this could be in the contract. Plus the bank itself gets its cut from the store for bringing them a customer. It's like if you were invited to a café supposedly for free food, and then it turned out they're charging you some surprise fee for the tablecloth and nice place settings.
If you're gonna take an interest-free loan, make sure there are no extra fees, or at least know about them beforehand. Sometimes it really is better than a regular loan if you're planning to pay it off on time and not early. But if there's a chance you might miss a payment - better not risk it, the penalties can be pretty steep.
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