simple... they're realize it affect the national economy... when a business is trying to survive and promote growth and create jobs...cannot be sustained by shorting on a stock based on someone greed to make money for the sake of it..and have nothing to do with the books or fundamental a business comes with...
look at the economic state US has gotten itslef into lately
job exported, good imported, ... so no wonder they decided to cut on greed..thus for the shorts.. that do not create nor sustain anything!!
I am sure those who short get away without paying taxes as welll...so why bother?
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