If increasingly more units of good y must be given up as each successive unit of good x is produced, then the pdf for these two goods is A downward-sloping curve that is bowed outward.
A downward slope of the demand curve means that demand will increase when prices fall. Quantity is on the x-axis and price is on the y-axis creating a downward sloping demand curve. It shows a constant descent. Although the curve slopes to varying degrees, a downward direction is inevitable. Such a downward slope of the demand curve from left to right explains the law of demand. This happens because price and demand are inversely related.
The supply curve from a profit-maximizing firm can be vertical, horizontal, or sloping. Industry supply curves can be downward, but individual company supply curves are never downward.
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