Suppose students at our school are voting for the lunch menu over the course of one week. The following is a list of options provided by the caterer.
-
Meat Lovers
- Meat loaf
- Hot dogs
- Pork cutlets
- Beef stew
- Liver and onions
-
Vegetarian
- Vegetable soup and peanut butter sandwich
- Hummus, pita, and veggie sticks
- Veggie burgers and fries
- Chef’s salad
- Cheese pizza every day, double desserts every day
-
Something for Everyone
- Chicken nuggets
- Burgers and fries
- Pizza
- Tacos
- Leftover day (all the week’s leftovers made into a casserole)
- Bonus side dish: pea jello (green gelatin with canned peas)
To vote, draw one of the following symbols next to each menu option to show your first, second, third, and last choices. If you use the slips of paper from your teacher, use only the column that says “symbol.”
A. Meat Lovers __________
B. Vegetarian __________
C. Something for Everyone __________
D. Concession Stand __________
Here are two voting systems that can be used to determine the winner.
Voting System #1. Plurality: The option with the most first-choice votes (stars) wins.
- How many people in our class are voting? How many votes does it take to win a majority?
- How many votes did the top option receive? Was this a majority of the votes?
-
People tend to be more satisfied with election results if their top choices win. For how many, and what percentage, of people was the winning option:
- their first choice?
- their second choice?
- their third choice?
- their last choice?
Voting System #2. Runoff: If no choice received a majority of the votes, leave out the choice that received the fewest first-choice votes (stars). Then have another vote.
If your first vote is still a choice, vote for that. If not, vote for your second choice that you wrote down.
If there is still no majority, leave out the choice that got the fewest votes, and then vote again. Vote for your first choice if it’s still in, and if not, vote for your second choice. If your second choice is also out, vote for your third choice.
- After the second round of voting, did any choice get a majority? If so, is it the same choice that got a plurality in Voting System #1?
- Which choice won?
-
How satisfied were the voters by the election results? For how many, and what percentage, of people was the winning option:
- their first choice?
- their second choice?
- their third choice?
- their last choice?
- Compare the satisfaction results for the plurality voting rule and the runoff rule. Did one produce satisfactory results for more people than the other?