Conforto insists that scrapbooking is simply maturing, not peaking, arguing that fast growth followed by a drop-off is a typical curve for hobbies in their infancy.

FORBES: Thanks For the Memories

The retail prices and costs could drop with volumes as both follow a downward sloping curve.

FORBES: Apple Partners To Subsidize iTVs; Sharp To Produce Sets

Taken altogether, these pressures drop us to the bottom of the U in the U-shaped curve of happiness.

FORBES: Study: Humans Aren't the Only Apes that Have a Midlife Crisis