“Bull markets climb a wall of worry” (Wall Street proverb)

moneymaker

Investopedia
Wall of Worry
A phrase used to describe a bullish market trend occurring in the face of negative uncertainties.

When stock prices are rising regardless of market uncertainties, the stock market is said to be climbing a wall of worry. These worries may include political or economic risks. Once the perceived risks have been resolved or have past, average market share prices tend to decline.

16 September 1958, The Derrick (Oil City, PA), pg. 12, col. 3:
To illustrate: every basic bull market must have a Wall of Worry on which to climb. A bull market goes up in the face of intermediate bad news based on current facts that are very upsetting to the statisticians, who usually fight the move until it nears an intermediate top, when, as the news turns better, they finally give up and turn bullish.

dara

we are already in a bull market.

kosh

That is to say, stock market recovers before the economy recovers. To jump in when the economy confirms recovery is to jump in at an intermediate top and would be too late.