As of Friday, investors seemed to be favoring a positive resolution of the Greek crisis. The Russell 2000 bounced off the key 127 support level:
and the two Greek stocks, most closely associated with the outcome of the negotiations, finished the week inside a box:
The surprising call for a referendum in Greece is calling these assumptions into question. It also reinforces the notion that, given a chance to screw things up, politicians will never fail to do that.