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What do you mean by price difference and spread?
Price difference: refers to the difference between the prices of goods or services. The price difference effect is the situation reflected by various markets caused by the price difference.

Interest spread: mainly refers to the interest difference between loan interest income and deposit interest expenditure. Different from interest margin, interest margin refers to the difference between interest rates, and interest margin is more inclined to the difference between income and expenditure, which is a quantification of the concept of interest margin.

Compared with certain costs such as commission and stamp duty, bid-ask spread is an uncertain transaction cost. The price difference in quotation-driven market consists of the inventory cost, adverse selection cost and order processing cost of market makers, while the price difference in order-driven market consists of adverse selection cost, order processing cost and execution cost, and there is no inventory cost.

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The so-called carry futures refers to the arbitrage of futures, and the carry trade mainly refers to: lending low-interest currencies-converting them into high-interest currencies-and then investing in the hottest areas (countries) in the asset market, thus earning double benefits of spreads and asset appreciation.