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How does the internet work? Internet is like the phone networks. You pick up a phone and dial a number, the phone on the other side rings. The internet is the same thing. The phone now is the computer or anything with an IP.
Another advantage is the products can be exposed to a large number of potential customers. Suppose you live in a town with 10,000 people. This is not very small town in the US. You have something to sell but within the 10,000 people, only 0.01% people may be interested in your product.
What should we avoid when shopping online? First, try to buy products from sellers with good reputation. When you buy on ebay, make sure to buy from sellers with an overall good rating. Usually good sellers should have an overall more than 95% positive feedbacks.
Now you go to the internet, there are billions of people there. The market is not hundreds or thousands bigger than it in the town. If the market is so big, the seller can afford to sell it for much less. That's how the internet offer us the products with lower costs.