A Scout goes to the trading post and asks to buy some tenderfoot brains, that'll be 25 cents. OK, (money and brains exchanged).
Narrator: six months later. Same Scout back at the trading post. "I'd like to buy some second-class brains." "That'll be 50 cents." OK, (as before)
Narrator: six months later I'd like to buy some first-class brains - 75 cents - OK...
Narrator: a year later I'd like to buy some star brains - 1.00 - OK...
Narrator: a year later I'd like...Life brains - 1.25 - OK
Narrator: a year later I'd like... Eagle brains - 1.50 - OK
Narrator: 15 years later Same Scout goes to the trading post again. "I'd like to buy some Scoutmaster's brains" "That'll be 200 dollars an ounce" "200 dollars, why so much?" "Do you have any idea how many Scoutmasters it takes to get an ounce of brains?"