From an ad in today's newspaper:
"All Prices slashed for Immediate liquidation."
Capital letters indicate you're starting a sentence or using a proper name. A proper name is a city's name, or a product's name, or a person's name, for example. "Prices" and "Immediate" are not proper names, so these words should start with a lowercase letter. I often see this random use of caps, perhaps an attempt to make words stand out.
I find It rather Annoying. And I wish Writers would Stop doing it.
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