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Exact(45)
In past price wars, the discount carrier usually made money.
If markets were completely efficient, then past price movements should tell you nothing about the future.
In past price squeezes, oilmen confounded the experts by finding unimagined savings.
In the past, price caps have been used to bring down the coast of calling abroad.
In its strongest form this states that past price movements should give no useful information about the future.
How can information that is widely available, like past price performance, be a useful guide to future price movements?
Similar(15)
It's possible that this is a triumph of rationality, since there's no law that stocks must dip below their past price-to-earnings patterns before things get better.
In the past prices offered by suppliers were good for three months.
And in the past prices have far overshot that average before falling back.
In the past, prices have been as much as 50percentnt lower than in Britain.
Farecompare.com offers star ratings to show how good the fare is compared with past prices.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com