Sketch the isoquants corresponding to the following situations. Give a written explanation of what is going on.

a) Thermos production, with thermos carafes on the x-axis (as one input) and thermos lids (as the other output on the y-axis.) Assume capital is held constant.

b) Office building construction, with labor on the x-axis and capital on the y-axis.

c) Hamburger production using either gas grills (x-axis) or electric grills (y-axis), assuming the two types of grills are perfect substitutes.