A lot of it as to do with the various government stimulus, FED balance sheet going through the roof, as well as more demand from companies providing services for the many "work from home" (WFH) workers due to lockdowns.
But if we look into the details it's not that pretty, as FAANG stocks are responsible for most of the rise. In other words, it's not a broad market rally, and many NASDAQ stocks are still way down.
From a historical perspective, most bear markets will have a bear market rally, as shown from the S&P 500 chart below between 1998 and 2020. Source: NorthmanTrader.
You could always say "but Dark Horse, 2020 won't be like the great depression, and instead, it's just like 1987, we had the "best economy ever" and it's all up from here after everybody goes back to work + FED put!". To that argument, I'd answer the market was not overextended in 1987 as shown by the market cap to GDP ratio aka "buffer indicator".
Before the crash in 1987, the market cap to GDP was just 64%, and now it's around 130% before dismissal GDP numbers are announced meaning it should be above the previous record soon.
I'm a big believer in mean reversion of things like market cap to GDP and PER ratio / CAPE ratio. We previously wrote how many markets were overvalued including the US markets, and GMO just released their quarterly update with their expectations of yearly returns for various markets over a 7-year period.
That means large US stocks may lose around 1.5% a year over the next seven years, not a nice proposition especially when considering those numbers were after the correction in March 2020. Also note bonds don't look to be a good place to hide either, but emerging value stocks have some good prospects, and we previously mentioned that Chinese commodity producers may be a place to look for investment opportunities.
I'd still stay very prudent here as there are many risks around. We are quite surprised people expect a vaccine by 12 to 18 months, as we would like to remind our readers that some virus-induced diseases don't have a vaccine, think AIDS or dengue fever. The latter is even scarier because you don't develop immunity, and instead, the risk of death is greater the second time, and even more the third time. There have been reports that released COVID-19 patients have contracted the disease again, so herd immunity is not even a given, but so far there's no indication that the second infection is nastier like for dengue fever.
Stay safe! We live in scary times for our health, finances, and freedom from governments.