Nothing can convince me that 11% in a day (in either direction) shows a healthy stock market. By the way, here are the top 20 biggest one-day percentage gains in the history of the DOW.

17 of 20 were during the Great Depression. Of course, feel free to

1 03/15/1933 15.34
2 10/06/1931 14.87
3 10/30/1929 12.34
4 09/21/1932 11.36
5 10/13/2008 11.08
6 10/28/2008 10.88
7 10/21/1987 10.15
8 08/03/1932 9.52
9 02/11/1932 9.47
10 11/14/1929 9.36
11 12/18/1931 9.35
12 02/13/1932 9.19
13 05/06/1932 9.08
14 04/19/1933 9.03
15 10/08/1931 8.70
16 06/10/1932 7.99
17 09/05/1939 7.26
18 06/03/1931 7.12
19 01/06/1932 7.12
20 10/14/1932 6.83