Bad Economy Coming or Here?

The Economic downturn has me a bit nervous. Fortunately I have no stock at this time. I heard that Apple computer that was over 200 at New Years is now at $125. I had two hundred shares at $15 a share and sold it at $18 a share. I am torn between buying low or just sitting tight to see if this thing is as serious as it seems. I can see it digging into my retirement at this moment.