Not my idea.
I read it somewhere but always kept it in mind.
What I want to find is a variety of potato that stores for a LONG time.
If a person doesn't have a root cellar, or basement, buy the dirty potatoes, make a light proof wooden box, and keep it on the cool floor of the pantry/basement?
We also use a lot of sweet potatoes. IMO, they keep longer, have more food value, and are the easiest to microwave. Make sure to stab them with a fork before you nuke them (4 min on each side) to let the steam out - I have exploded a few.
A little fresh butter, brown sugar, cinnamon, chopped nuts, and miniature marshmallows makes for a great sweet potato topping!