The problem is not leverage by itself. A highly-leveraged ES trader does not cause systemic risk because if his account goes below required margin he's just kicked out of the casino.Quote from intradaybill:
You are totally confused. Why do you think the theory of derivatives is wrong if someone with 10K in his account trades two ES contracts? Do you think is overconfidence, bad decision or plain stupidity?
The politicians are trying to put the blame on mathematics. People like you who do not understand mathematics, are fooled by them. Taleb is "fooled by mathematics".
The problem is when traders are allowed to make bets they cannot cover if wrong. The banking system leverage is not desirable because if all banks fail together no one can cover lending or trading losses.
You insist on ignoring the fact that quantitative Nobel Prize winning risk models were introduced explicitly with the purpose of increasing leverage, while telling their naive users that their positions were not risky.
In fact, the whole Federal Reserve System has been created so banks can leverage more and more. Leverage is the essence of Fractional Reserve and Central Banking.
Closing down the Fed means banks cannot leverage thus banking crises cannot happen.