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People should just pick up their trash it isn't difficult!!!

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Make it impossible to spread

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2. Duh.

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Provide a ketchup container

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Appeal to the student's better natur because otherwise you're punishing everyone, not just the people who are causing the problem.

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I believe that if you make it so that ketchup cost a little bit and also change the containers

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2. Duh.

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Bribery

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Appeal to their sense of social responsibility

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Take it away

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Fear and brain washing are the best ways to change someone's behavior. Fear, is a powerful and useful emotion. Using that fear to your advantage is usually great for getting results. Another method of changing someone's behavior is brainwashing. You can change how someone views something. Use that propaganda.  You can use these for the ketchup in the cafeteria. Severe detention for everyone they catch with a ketchup container. Have posters and different psa's with sayings like "keep your ketchup in the bottle" and "ketchup on the table makes our cafeteria unstable" if there is a huge campaign for ketchup. People should likely respond

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2, because people might not be as respectful

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I believe if we invest in something to prevent the ketchup spilling, such as spill-proof containers or a liquid-proof clear coat on the tables to make the tables much easier to clean off, then that may help. Maybe something like what they make for shoes. A spray-on clear coating that repels anything with water. Or we can simply make the cafeteria larger. A larger space with more room to move may help prevent such accidents, which I believe is caused when someone with the ketchup is jostled by passing people with their ketchup.

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I would choose number 2 because people might not be the most respectful, so if you ask them to clean it up they might not. Then I wouldn't go with number 3 because adding a cost for ketchup is ridiculous because everywhere else it is no addditional cost to have.

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Pain

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Number 3 , because if you really want ketchup you should pay for it. People take too much of it anyways

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2, because 1 won't work consistently (people will not care) and 3 punishes those who do not cause problems.

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Therapy