You now know that demand equations can be estimated using regression methodology. Suppose that you collect data and run a regression to estimate the demand equation for a particular product. The resulting demand equation is as follows: QD=6000-2PX-0.21+4Py-2Pz 1 points Save Answer Where: QD = quantity demanded of good X Px = price of good X I = consumer income, in thousands Py= price of good Y Pz= price of good Z Based on the equation, what is the relationship between Good X and Good Z? O Good X and Good Z are substitutes for consumers. O Good X and Good Z are complements for consumers. Good X and Good Z are unrelated goods. O Good X is an input in the production of Good Z.