First - what is the "Summer hole"? Its called "Silly Season" in most of the English speaking world and refers to the summer time when politicians are on holidays and news stories are drying up. Some may refer to it as the "News draught" or some kind of (sour) gherkin time.

Pessimissm spreading through marketplace - A European Central Bank executive has said that all developed countries could face a Greek-style debt crisis. [BN-Net Economy News]

The global retail turnover is estimated to be around € 6 trillion (Euros); that is € 6,000,000,000,000 (Euros).

Considering there are around 7 billion people in the world (7,000,000,000) the average turnover would be in US dollars:

US$ 7,000,000,000,000/7,000,000,000 = 1,000.