Spread 有好多种,我不一一解释,你要自己看书。
只是讲讲我为何由naked 转为spread吧。首先看老蛇的图,1040 没有那么易一下只冲破,可能要横盘几天,其它股票都会隧市跌势减弱。那么我的amzn naked put 所包含的iv, time value就会大减,我的profit 就小了。但我应为amzn still going down to fill the gap, 因为major support lever 以破(等confirmed).那么我可以用9月份的bear put spread 去control risk, instead 用naked put.
H&S neckline 1040. ADV:DEC = 1:13 plus strong volume ===> capitulation set up. If S&P drops below104 ...
ypm968 发表于 2010-6-29 10:48
agree with duizhang. Shorts should at least cover at 1042. But I won't buy anything here. Two years trading experience tells me that we should follow the main trend, not to catch every wave (small wave inside the big wave.)
Shanghai/Shenzhen is down 4-5% today. IPO of Agriculture Bank sucks off all the liquidity. Japan is down due to unexpected rise of unemployment. Europe is down due to the return of sovereign crisis. There is a new round of national strike in Greece.