Linear algebra 1. Real business cycles: Consider the following macroeconomic model for real business cycles taken from Dejong and Dave (2011) Chapter 3: Suppose that we have a representative household whose goal is to maximize their utility from consumption and leisure over time: U = E0 Errata I.) t=0 where E0 is the expected value at time 0, )6 is a parameter reecting the household's discount rate (time preferences), at is the household's consumption at time t, and It is the household's leisure time at time t. For this problem to work, we have to introduce four constraints. The rst constraint is that the household produces goods using a Cobb-Douglas production function. That is, a: 10: yt = 33k; \"3 Where yt represents the GDP at time t, 2: represents and exogenous (i.e., cannot be optimized or changed) technology stock at time t, kt represents the gross capital stock at time t, and m represents the amount of labor supplied at time t. The second constraint is that total time spent working and at leisure should add to some xed constant. Without loss of generality we can dene the total to be one (1): l=nt+lt The third constraint is that GDP can be spent in two ways: consuming and investing in future capital: yt=Ct+it where it is the amount of investment at time t. kt =t+ (l 6)kt The last thing we need to dene to make the problem solvable is the utility function. For this we are going to use a constant elasticity of substitution (CES) form. That is, (sleek!) u(c,l)= lp