One of the principles of psychophysics is that change in the physical environment is not always matched by equal changes perceptually. If Madison Wilson were creating a new drink, what would psychophysics tell her?

She could make the drink twice as sweet by adding twice the amount of sugar.

She would need to create promotions to tell customer's how "sweet" the new drink is$.$

She would need to research how the perception of "sweetness" changed by the amount of sugar added.

She would need to look at the subliminal aspects of "sweetness."