https://en.m.wikipedia.org/wiki/Long-Term_Capital_Management
https://en.m.wikipedia.org/wiki/Long-Term_Capital_Management
Multiple wall street firms (at US Government urging) needed to urgently inject massive capital into the markets to contain a near-systemic collapse.
PBS produced a phenomenal documentary, The Trillion Dollar Bet[1], which covers the development of Black-Scholes and the rise and fall of LTCM. Highly recommended.
So this isn't a knock on the BS model necessarily, but human greed.
This is all from the excellent book "When Genius Failed."
Two ways. Gradually and then suddenly.”
How quaint. In 2019, tech companies burn through billions of dollars of capital every single year, and we call them business "successes".
In the case of LTCM the government needed to bail out LTCM positions. That is why it is different.
The banks keep dealing with high levels of leverage. It keeps predictably blowing up in their faces. The government/Federal Reserve is responding by making it easier to borrow money and then VC/Unicorns etc borrow.
The links aren't perfectly causal, but I bet that under normal conditions (if interest rates were allowed to rise into the 2-6% band in a sustained way and the government stopped handing out free money) then suddenly the unicorns would be subjected to market logic such as a need to make money to receive a high valuation.
I quote, “ Technically, the Fed didn't bail out LTCM. It used no federal funds. It merely brokered a better deal than the one Buffett offered.”
From https://www.thebalance.com/long-term-capital-crisis-3306240
> Tech firms are losing cash but generally gaining value towards an IPO.
...but they don't always. This makes the original statement sensationalist nonsense as it's happened multiple times (over the time period mentioned).
Valuation is screwed up in both "types" of businesses, but the methodology is irrelevant to the claim when it's apples to apples for the market.