Pulmonary artery originates

Which of all the following is not an assumption of Marshall Consumer Theory of Demand?

What is the correlation coefficient of the straight line ax+by+c=0 wherein a>0 and b <0

With fixed costs of $400, a firm has average total costs of $3 and average variable costs of $2.50. Its output is:

Which one of the following is not an assumption of Classical Linear Regression Model

Which of the following statement is/are true regarding classical theory of income and employment?

  For the regression specification y = α + βx + ε the OLS estimates result from minimizing the sum of

The dummy variable trap occurs when