You are interested in explaining democratic backsliding. You are considering two models. Model 1: Backsliding = o + BGDP + BGDP1000 + 0 Controls + u where GDP refers to the total GDP of the country and GDP1000 indicates the value of GDP expressed in $1000. Model 2: Backsliding = Po + BGDP + B2Globalisation + 0, Controls + u where globalisation is an index of economic openness. Answer the following questions: 1. Can you estimate Model 1? Please justify your answer with as much as detail as possible (5%) 2. What are the two main empirical challenges when estimating model 2? Please justify your answer with as much as detail as possible (5%)