After the strategy is established, the effect of implied volatility depends on where the stock is relative to your strike prices.If the stock is near or between strikes B and C, you want volatility to decrease. This will decrease the value of all of the options, and ideally, you’d like the iron condor to expire worthless. In addition, you want the stock price to remain stable, and a decrease in implied volatility suggests that may be the case.If the stock price is approaching or outside strike A or D, in general you want volatility to increase. An increase in volatility will increase the value of the option you own at the near-the-money strike, while having less effect on the short options at strikes B and C. So the overall value of the iron condor will decrease, making it less expensive to close your position.