not to be facetious, but i remember one of the old adages being (to paraphrase), the market will trade in a way as to f*** over the most amt of ppl the most number of times
it's like a college class where 1-2% get As, 3-4% get Bs, 95% get Cs-Fs
- perhaps because the 1-2% include funds like Jim Simons' Renaissance Technologies/ real sharp guys etc which are pulling billions in profits out from the hapless PMs hired on nepotism that can barely make an excel spreadsheet work
also maybe to analyze this in more detail,
(a) most people think in the similar ways, from the same type of education/ pop culture consumed/ habits etc, even human DNA is like 99.9% similar, so it's not hard to see why the population consists of mostly similar traders
(b) even now with algos, they are still programmed similarly by people with similar quant backgrounds, ppl who are using the same resources, not to mention job hopping/ not very many actual secret sauces out there. it's like, how much different can spaghetti bolognese be, it's the same thing only with slightly different marketing, the variations on the same theme don't make that much of a difference
(c) when most people acting in similar ways per above/ enough critical mass have either sold/ been stopped out/ liquidated, margin called, the flood of supply dries up, which puts a stop to the dumping. then the demand kicks in with waves, eg. those who are closing their shorts, the PPT, the vol sellers, the rest of the cavalry
long story short, it's price discovery, in that the market repeatedly prods ppl to "discover" how much pain they can take
