Hearing AIDS bought online are so cheap, why are physical stores so expensive? What is the difference?

Now is a market economy, the price is liberalized, and each has its own marketing ideas. It is not surprising that some prices of the same brand are high, some are low and some are quite different. Some may also be counterfeit products. Some people think that the high price is good, while others think that the low price is appropriate, which varies from person to person. Whether it is suitable or not, you need to choose and judge for yourself. "Don't be afraid of not knowing the goods, but shop around" and "shop around" are necessary. In the market economy, if you don't know the goods, you may be cheated or fooled if you keep an eye on them. "When in Rome, do as the Romans do" is the same. Nowadays, we must understand some rules of market economy and learn to buy things. For expensive things, you should know, learn and master some knowledge in advance before buying.