A rule is a rule of economy stated as follows: "In an efficient market, all identical goods must be sold at the same price."All sales people will focus on the highest price may be sold, the buyers will flock to the lowest price can buy, but in a perfect market, supply and demand will converge at a point is invariant.For example, goods may be traded on financial markets, there will only be a bid price, and a price is offered for sale. Although there is a little difference between the two types of this price, but a price rule still applies. Not a person who will sell the goods at a lower price than the price low price bid of the person who created the market, or buy at a price higher than the price offered by the creation of the market
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