What is inflation and when you should really start worrying about it

Some investors worry that fiscal and monetary stimulus will drive up inflation.
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Infaltion rose 0.9% from May to June, higher than the consensus estimate of 0.5%.
Where most expect inflation to be temporary, others fear a dangerous spiral, or "runaway" inflation.
Here's what you need to know about inflation, where it stands today, and when you should start to worry.
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After decades of weaker-than-expected price growth, America h