An economy is like a balloon. Pump hot air into it and it will soar up into the heavens. If it soars too high for too long, it eventually gets worn or torn, or both, and starts to collapse.
A soaring balloon is not that difficult to keep in control. You can always pull it down with a string.
A collapsing balloon is a good deal trickier to manage. The same string that you used to pull it down cannot be expected to hold the thing up for you.
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