Suppose the price of something that you purchase regularly changes. Imagine, for example, that monthly rental prices fall (yeah, right). If rent becomes cheaper, it's like getting an increase in income. Your actual income wouldn't change, but you would have more money to spend on everything you buy.
The reduction in rent also means that renting a place to live is now relatively cheaper, compared to the other things you spend money on, than it used to be.
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