is https://en.wikipedia.org/wiki/Price_discrimination very different from buying things off ebay? why would salespeople even exist if there was perfect information?

so people want efficient markets and price discovery..but only when it results in them paying lower prices? otherwise the law should step in and preferably set prices by fiat or magic?

ok my personal take on buyng knick knacks in chatuchak is.. assume everything is cheap , thats why i come to thailand, i can afford this...