Based on your financial expertise, provide your response or viewpoint on the given financial question or topic. The response format is open.

What are overnight fees? [duplicate]
From the etoro website: In the financial trading industry, rollover is the interest paid or earned for holding currency overnight. Each currency has an interest rate associated with it, and because currencies are traded in pairs, every trade involves two different interest rates. If the interest rate on the currency you bought is lower than the interest rate on the currency you sold, then you will pay rollover fees. If the interest rate on the currency you bought is higher than the interest rate of the currency/commodity you sold, then you will earn rollover fees. http://www.etoro.com/blog/product-updates/05062014/important-upcoming-change-fee-structure/