Approximately what percentage of the world's extinct species became extinct before humans appeared on earth?

Suppose that the inflation rate has been 3 percent per year for several years, and the unemployment rate has been stable at 5 percent. Unanticipated changes in government policy cause the inflation rate to increase to 6 percent

In the short run, we would expect the unemployment rate to A) increase, but the exact amount cannot be known for sure. B) decrease. C) increase to 10 percent. D) remain constant.

Can nominal GDP ever be less than real GDP?

What will be an ideal response?