how do you think wall street makes money?
all the firms depend on selling or buying. that's how they get bonuses.
semp
It's like car salesmen. Car salesmen might skew the price cars here and there, but the general prices of cars and trucks are determined by factors much larger than the effect of car salesmen.
The financial market overall is stocks, bonds, debt, and derivatives altogether.
It is about a quadrillion dollars worth of stuff.
Issued by, bought buy, traded by, and facilitated by an enormous complex system. Stock brokers are one tiny part. Even for the tiny fraction of transactions stock brokers are involved in, their clients are influenced by more than just the broker (who is like a salesman): client's internal thoughts, world conditions, market trends, news, etc.
Its a big collective, complex system like the weather.
The Federal government can exert major influence. Entities with enough influence to get the Federal government to do things can exert major influence. Enough entities all doing the same thing like a school of fish (like all stupidly buying crappy mortgage-backed securities pre 2008) can exert major influence. That's not stock brokers.
Yet even all of that might not be able to skew the market forever. Eventually, things get priced by the gigantic, complex collective system overall.