http://www.antipope.org/charlie/blog-static/2012/01/potato-salad-battle.html

TRX
January 29, 2012
44:

Local versions of potato salad vary across the USA. In the parts of the South I grew up in, potato salad is similar to:

chunks of potato
chopped egg
finely diced pickles
enough mustard to coat the solids

"Institutional" potato salad mostly consists of: (sample recipe)

1 gallon mayo
1 pound chopped celery
1 pound raw onion
1 teaspoon instant dried potato flakes