See Bob Schiller's work (for which he received the econ Nobel prize in 2013).

The “weak version of EMH” has nothing to do with markets being “efficient”, it's a property of random markets. Assimilating the two just Fama's motte-and-bailey fallacy.

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eru a day ago | parent [-]

When you say 'random' you probably mean that market prices are a Martingale? See https://en.wikipedia.org/wiki/Martingale_(probability_theory...

That's very, very related to being efficient.

> Assimilating the two just Fama's motte-and-bailey fallacy.

No, not at all.

	▲	littlestymaar 19 hours ago \| parent [-]
		> That's very, very related to being efficient. “No, not at all”.