**Up to the 1960s**

A peasant sells a bag of potatoes for $10.

His costs amount to 4/5 of his selling price.

What is his profit?

**In the early 1970s**

A farmer sells a bag of potatoes for $10.

His costs amount to 4/5 of his selling price, i.e., $8.

What is his profit?

**1970’s (new math)**

A farmer exchanges a set P of potatoes with a set M of money.

The cardinality of the set M is equal to $10 and each element of M is worth $1.

Draw 10 big dots representing the elements of M.

The set of production cost is comprised of 2 big dots less then the set M.

Represent C as a subset of M and give the answer to the question:

What is the cardinality of the set of profits?

**1980s**

A farmer sells a bag of potatoes for $10.

His production costs are $8 and his profit is $2.

Underline, the word “potatoes” and discuss with our classmates.

**1980’s (alternative math)**

A kapitalist pigg undjustlee akires $2 on a sak of patatos. Analiz this tekst and sertch for erors in speling, contens, grandmar and ponctuassion, and than ekspress your vioos regardeng this metid of geting ritch.

**1990’s**

A farmer sells a bag of potatoes for $10.00.

His production costs are 0.80 of his revenue.

On your calculator graph revenue versus costs.

Run the “POTATO” program on your computer to determine the profit.

Discuss the result with the other students in your group.

Write a brief essay that analyzes how this example relates to the real world of economics.