1. Mill's is an empiricist -- indeed he even thinks that the truths of arithmetic are established by observation. Yet he defends a deductive method -- a method a priori -- for economics. What exactly is Mill's "method a priori"? Is it consistent with his empiricism?

2. What does Mill mean by an "abstract science"?

3. Why are hot-air balloons not "exceptions" to the law of gravity?

4. Why does Mill think that the method a posteriori has little applicability to economics?