Of the following, which would be the last choice for a bank facing a reserve deficiency?

A time series graph

A) uses bars rather than lines. B) is not useful if the goal is to determine a variable's trend. C) shows points that are scattered. D) depicts a series of good economic times a nation had. E) shows how a certain variable changes over time.

When one automaker begins offering low cost financing or rebates, others tend to do the same. What two oligopoly models might offer an explanation of this behavior?

What will be an ideal response?