PCM always has an ask for a 100 share lot 1 or 2 cents below what is probably the real ask price. This seems to be a way to keep sales prices down a little? Sellers might be inclined to set their limit prices below this price thereby giving the market buyer a lower price. This would be effective for a market maker looking to purchase at a couple of cents below what he should be purchasing at. I'm sure this is done for many stocks, but for PCM it seems to be done all the time.