George donates money for charity only when somebody he knows approaches him for such donations. This is an example of ________

Since the late 1980s, the share of the net public debt owed to foreign interests has

A) gone up and then down, finally settling at around 10 percent. B) decreased. C) increased. D) remained constant.

Between 1950 and 2004, standards of living in the OECD countries

A) did not change at all. B) were converging. C) all increased at the same rate. D) decreased at the same rate. E) decreased, but at different rates.