That's what leads me to think that it is a local (website) issue when the periods of poor conversions come. It would be nice to be able to blame it on google but there's just no real evidence for me. I can come up with reasons why they would do it, just no evidence that they are.
We average around 250 transactions (sales) a day across 4 sites. monday: 258 tuesday: 263 wednesday: 255 thursday: 124 last thursday: 251 thursday before that: 249