1, let the seller modify the price.

2. Many shops on Taobao have tools to make up the price difference, and all the price differences are 1 yuan. This is just one of the specialties.

If the payment has been paid, let the seller return the rest.

Extended data:

The price difference is sometimes a premium and sometimes a discount. Hedging profit is a market transaction using the price difference between futures contracts. The key factor of arbitrage is the change of price difference.

The spread can be widened or narrowed, but when the spread between two futures contracts becomes abnormal, it creates arbitrage opportunities for traders. The difference in price is related to profit. The real challenge faced by arbitrageurs is how to grasp the biggest price difference in the same period.