Here is a simple long term technical idea to not suffer terminal decline in a company. All of the below are big winners and you could say well I could have ignored the downturn, which is true and for example the GFC was not company specific so you could have ignored it. But by using these rules these rules you won't get caught that time it is terminal. You also won't get stuck in dead money for years.

Using a 50wk EMA + 200wk EMA Cross Signal there is 1 occasion since the 1983 Buy Signal where you would have sold $DHR. That was not company specific it was the GFC. It's okay though because you'd have bought it back soon after.

$DPZ Buy signal in 2010. Still no sell signal....

$AMZN bought in 2007, Sell Signal has just triggered...