There are two scripts white and pink , the main difference between them is how to consider the final reverse of American market during Great Depression whether in 1932 or in 1941. Concerning fundamental factors , there are 2 main factors pointing to dramatic plunge of US economy. The first factor is obvious , COVID - 19. The second one is zero FED rate, so the great number of American people have not opportunity to refinance their debts and mortgage by which there are congested. During long period of time credit used to be backbone of economic growth in developed countries, when FED rate achieved to zero it means that such system stop performing. Probable targets of current plunge are 2151 , 1411, 670