Here is a great contrarian point to the CityLab discovery about induced demand. An individual is unwilling to walk 2 miles to the nearest grocery store, the solution would be to take a bus, however a route does not exist the ideal solution would be a car.
However, entrepreneurs stepped in and identified what the non-car community would pay for things and still turn a profit: $5 for milk from readily available stores. As an aside, how is this any different from Walgreens/CVS' model of having multiple convenient locations, but charge a larger premium.
The idea of a food desert is non-sense as people have access to food, they just want cheaper prices.