The long-run average total cost curve: Group of answer choices can be derived by summing horizontally the average total cost curves of all firms in an industry. indicates the lowest unit costs achievable when a firm has had sufficient time to alter plant size. has a shape that is the inverse of the law of diminishing returns. displays declining unit costs so long as output is increasing.

The state in which the manufacturing company you work for is located regulates the presence of a particular substance in the environment to concentrations ≤ x. recently-released, reliable research endorsed by the responsible federal agency conclusively demonstrates that the substance poses no risks at concentrations up to 5x. your company has asked you to consider designing a new process with a waste discharge stream containing up to 2x of the substance. based on the stated conditions, describe this possible.