A market supply curve has three prices -- $1.50, $2 and $2.50 -- with a quantity supplied of 5 tonnes at the price of $1.50, 9 tonnes at $2, and 13 tonnes at $2.50. a. Is this supply curve a straight line? 0 This curve is a straight line because it has a constant slope of 0.125. O This curve is a straight line because it has a constant slope of 0.50. O This curve is not a straight line because it does not have a constant slope. O This curve is a straight line because it has a constant slope of 0.25. b. What is the price elasticity of supply, es, between prices $1.50 and $2 and between prices $2 and $2.50? Do not round your interim calculations before obtaining the nal solution (i.e. do not clear your calculator). In each case, express the number to two decimal places and do not include a positive or negative sign (i.e. 1.67, not -1.7 or +1667). The price elasticity of supply is between prices $1.50 and $2, and is between prices $2 and $2.50. c. Based on your answers to parts (a) and (b), must a supply curve with a constant slope have a constant numerical elasticity? O A supply curve with a constant slope does not need to have a constant elasticity. O A supply curve whose slope varies must have a constant supply elasticity. O A supply curve whose slope varies has a supply elasticity which varies by exactly the same proportions. O A supply curve with a constant slope must have a constant supply elasticity