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Here are the clues. Preceding each clue is the number of letters in the answer.

Clue $1$: $11$ letters. the constraint in indifference theory

Clue $2$: $16$ letters. the change in total utility that comes from consuming one more good

Clue $3$: $5$ letters. measurement of want satisfying power

Clue $4$: $12$ letters. this marginal rate is the slope of the indifference curve

Clue $5$: $6$ letters. must be spent at optimum

Clue $6$: $7$ letters. where consumer optimum is found

Clue $7$: $6$ letters. price change

Clue $8$: $5$ letters. income change