You walk up to a soda machine, put in a dollar, and are rewarded with a bottle of root beer. When you put in another dollar, you get another soda. Assuming that the machine does not run out of root...

You walk up to a soda machine, put in a dollar, and are rewarded with a bottle of root beer. When you put in another dollar, you get another soda. Assuming that the machine does not run out of root beer, which kind of reinforcement schedule does the machine operate on?

 Partial reinforcement

 Interval reinforcement

 Ratio reinforcement

 Continuous reinforcement

or No reinforcement