Quote from mwerbe:
srs is a proshares ultra short 2x leveraged etf the stupidest product to destroy wealth created in recent memory except for the new 3x leveraged etfs of course lol The etf is marked to market daily so if you buy it and it goes down 5% the first day you are down 10% on your original investment. If it drops 5% the next day you are down to 81 on a cost basis of 100 requiring it to go up 12% the next day to get you back to break even. Course it can work in your favor if you pick the perfect time to buy it but you lose in the long run to crazy high dividend yields and large management fees. You are better off shorting iyr in a margin account at least you know what you are paying in terms of margin interest and ex-dividend payouts