Hi, here is the question, thank you!

The Romer model can be described by 4 equations: Yt = AtLy,t AAtti = ZAtLa,t GONE Ly,t + Lat = L La,t = IL where Y is final output, A is ideas/knowledge, Ly is employment in production of final out- put, La is the number of researchers, and L is the population. i What are the endogenous variables? What are the exogenous variables and the pa- rameters? ( 5 points)