Что значит The lowering of interest rates will give a much-needed boost to the economy. ?

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“Interest rates” refer to banks and loaning credit. If the money loan isn’t paid off in an amount of time, then the person will have to pay interest, which is a percentage (like 20% for example) of the original loan in addition to the original amount of the loan. “Much-needed boost to the economy” means a positive effect on the economy. So “The lowering of interest rates will give a much-needed boost to the economy” implies that lowering the interest rates of loans (for example, from 20% to 15%) will be good for the struggling economy.