Has anyone noticed

Has anyone noticed that some of their old corps are losing profits..Well I have notice a few of my corps. are losing profits. The market these corps are in are not saturated at all. I have adjusted my prices accordingly yet..they seem to be losing profits..interesting. Any suggestions?

actually let me rephrase that message..Some of my public corps are losing value, yet my profits have become very, very thin..Like stated above the markets are not saturated..