Notice the low at 320 just prior to the 40th day. Then notice the slight penetration of this level and weak rebound after the 40th day. The 1929-1932 Bear Market Mania markets end with a great shock or crash. This is also a sign the business cycle has crested and is turning downward. When business drops off so do your sales and gross profits.
High debt places a requirement on the business to generate a lot of cash to sustain the debt.
In this climate, these companies become bankruptcy candidates. This then feeds the downward business cycle. Here is a graph of the 1929-1932 Bear market.