Before that, the level of expenditure in the economy was zero. There was production and consumption--people were growing food and consuming it--but nobody was buying anything from anybody else. So my action amounted to 10 units of increased expenditure. That's the money side.
On the physical side, in response to my expenditure you farmers:
- Increased output by a total of five units of actual food
- Decreased consumption by a total of five units of actual food
- Handed me a total of 10 units of actual food.
There's a term for your decrease in consumption, which is "crowding out." In addition to causing you to work harder, my expenditure has pushed aside some of your consumption--though note that it was an entirely voluntary action on your part: I had no way of forcing you to accept my offer that I would give you tokens in exchange for you giving me food.
What if you wanted to take my offer but didn't want to cut your consumption below 1.5? How could you still provide me with the one unit of food that you agreed to?