To date, it has not delivered any aerial refuelers or operational booms.
There are many possible causes for such sounds, he said, including large waves, earthquakes, shifting sands in dunes or deserts, far off thunder or man-made sources like factories, explosions or sonic booms.
In what are (sometimes euphemistically) called the developing countries, one year seems to follow the next without any booms or busts, just deadness in the water.
But back then natural resource booms of one sort or another produced their millionaires.
His 1922 book The Trade Cycle described the "tendency for confidence to pass into errors of optimism or pessimism, " which triggers booms and busts.
That's exactly how a death tax that was originally sold in 1916 as hitting only billionaires like the Rockefellers gradually began to apply to middle-class families who own, say, a successful auto-repair shop or invested wisely during the stock market booms of the 1980s and 1990s.
Multibillion-dollar campaigns to guarantee jobs or incomes for those left behind by national booms are now taking hold in the biggest markets of Asia.
You can blame Republicans who won't pass a budget, or Democrats who spend every single cent of tax money that comes in during the booms, borrow some more and then act all surprised when revenues, in a totally unprecedented, inexplicable and unforeseeable chain of events, fall during a recession.
While it provides insights into booms and their ending, it fails to explain why things must end quite so badly, or how to escape when they do.
The profits may then be reinvested or spent, creating significant stimulative effects, but usually this happens when market conditions are strong, exacerbating unsustainable market booms.
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