Agreed, except for shorting below the 20-week MA. Once the trend has reached that far, it's likely to be near a local bottom.
Take the August 2015 crash, for example. By the time the weekly closed below the 20MA, price hit the ultimate bottom less than a week later just 13% lower. You could easily short the bottom that way.
I would prefer to find a local bottom, then short the subsequent bounce to the 20MA, like February/May/July 2018. That way you don't have to hold shorts through such a painful drawdown.
Here:
Yes, you can see in those examples exactly what I'm talking about.
You said it's "safe" to short once we close below the 20-week MA. In February 2018, that meant shorting the February 5th open ~ $8,000 when the market literally bottomed
the next day and then bounced to $11,800. Shorting based on a weekly signal one day before the bottom, so you can be immediately stopped out or otherwise eat a 50% drawdown? Bad strategy!
That's why I suggested to use the 20MA breakdown as a signal of a bear market,
but not as a short entry. The chart shows clearly that you should not short the breakdown itself,
but rather the subsequent bounces to the 20MA. In other words, wait for a local bottom below the 20MA then short the bounce once you see buying exhaustion.
The parallel here: If you're entering shorts in the $7,000s after a 45-50% drop has already occurred, you better not be trading the weekly chart. You better be ready to exit very quickly on lower time frames. Unless you like getting your shorts squeezed for the next several weeks, that is.
I am not sure if we are talking about the same 20MA here, the one I am using in this chart is the 20 Simple Moving Average on the weekly chart
Yes, the 20-week MA.
and as you can see in the image above, every time we closed below the 20SMA on the weekly the trend shifted from bull to bear, except for what happened in Aug-2015 but that wasn't even a bull market then.
It makes sense to shift from longing mode to shorting mode.
But you make it sound like one should just start shorting when the weekly closes below the 20MA. That's not a good decision. One should wait for a proper short entry with decent risk/reward. That's all I was saying.