If the purpose of a cheaper decoy product is to highlight the relative value and attractiveness of a more expensive option, changing its price to sit within the same pricing boundary will supercharge any effects.

For instance, if you had a low price decoy product such as a half-sized mini muffin for $0.95, with a normal-sized muffin priced at $1.30, the decoy would be more effective at emphasising the normal muffin if it were easier to compare prices.

In this case, pricing the decoy muffin within the $1 boundary at or above $1 would allow people to more fluently calculate the value of a muffin that's double in size but only 30% more expensive.

Here, the appeal of a $0.95 bargain is outweighed by the spotting of greater value elsewhere, by making the cheaper bargain slightly less attractive and the more expensive bargain a bit of steal.