1, let the seller modify the price.

2. At present, many shops on Taobao have tools to make up the price difference, all of which are 1 yuan. Among those items for sale. You should look for them carefully, there will be no extra cost.

If the payment has been made, let the seller return the rest to you. It's simple.

Extended data:

The price difference sometimes manifests as a premium, and sometimes it is a premium. Hedging profit is a kind of market trading method that makes use of the price difference between futures contracts to make profits. The key factor of arbitrage is the change of price difference.

The spread will expand and shrink, but when the spread between two futures contracts is abnormal, it provides an arbitrage opportunity for traders. The difference in price is related to profit. The real difficulty for arbitrageurs is how to capture the biggest difference in prices under the same trend.

References:

Price difference-Baidu Encyclopedia