Which of the following would be a horizontal agreement to
fix prices and thus be illegal per se under Section 1 of the Sherman
Act?
I. An agreement between several sellers of lumber to no longer
sell on credit to purchasers.
II. An agreement between two sellers of lumber to set a maximum
price for what they will charge for lumber.
III. An agreement between a lumber wholesaler and a lumber
retailer that the retailer will charge at least $8.00 for a particular
piece of lumber.