MediaPost reports that search marketing prices decreased over the Black Friday weekend, indicating that the increased supply took its toll on keyword prices as marketers were off enjoying the holiday weekend, according to Fathom Online data and analysis. When they returned to the office the following Monday, many seem to have raised their bids to take advantage of the increased inventory, causing prices to rise 18 percent. Advertisers measured by Fathom Online spent an average of $1.66 per click, up 21 percent since September.