The demand for good X has been estimated to be ln Qxd = 100 - 2.5 ln PX + 4 ln PY + ln M. The income elasticity of good X is:
1. 1.0
2. 2.0
3. -2.5
4. 4.0
I know that the answer is 1.0, but how does this relate to Log-Linear Demand? For instance, how am I suppose to put this in context for others to understand?