This phenomenon is known as the "income" effect.
The income effect refers to an adjustment in the interest of a decent or administration, instigated by an adjustment in the purchasers' optional wage.
The income effect is the impact on real income when value changes - it tends to be certain and negative. Beneath, as value falls, and expecting ostensible salary is steady, a similar ostensible pay can purchase a greater amount of the great - thus interest for this (and different products) is probably going to rise.
