Land rents account for nearly

According to this Application, which of the following is a reason for holding cash?

A) for convenience B) fear of financial catastrophe C) to make a purchase when you cannot use a debit or credit card D) all of the above

The marginal product of a variable input is calculated as:

A) the change in total product divided by the change in output. B) total product divided by the change in the variable input. C) the change in total product divided by the change in the variable input. D) total product divided by the total quantity of the variable input.