2. If we measure goods on each axis, is an indifference curve positively (upward) sloped or negatively

Question:

2. If we measure "goods" on each axis, is an indifference curve positively (upward) sloped or negatively (downward) sloped? Why? If we measure a "good" on one axis but a "bad" (such as pollution) on the other axis, what type of slope do you think an indifference curve would have? Why?

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