You view tea and scones as perfect complements, and you prefer to consumer one cup of tea with one scone. Also, your indifference curves are plotted with tea on the vertical axis. If you presently have two cups of tea and one scone, what this the marginal rate of substitution (MRS) at this point

Infinity

Explanation:

In the case when the tea and scones are considered to be the perfect complements also you give preference one cup of tea over the one scone

Plus the indifferent curve with tea should be plotted on the vertical axis

So in the case when there is 2 cups of tea with one scone so at this point, the MRS should be at infinity as the indifference curve should be in downward sloping because we presume that there is preferences done at monotonicity

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