I can't believe you've never come across a hot dog stand that only sells hot dogs. In general, restaurants don't have a lot of regulations other than for food safety. Almost everyone has experience with them because they're so common so there's a large market size from all directions. Transactions are simple, quick, and straightforward and involve high levels of information from all parties. You know exactly how much you paid, and how much you enjoyed the item. The restaurant knows if they're making money off of those items or not. In short, restaurants are one of the most efficient markets out there, and you're unlikely to find a significant improvement that most successful restaurant owners have never heard of.

These would not be restaurants. They would be food factories, and already exist. You can go into a grocery store and buy pre-packaged pre-made food from dozens or hundreds of different factories collected together for your convenience

There are a handful of startups in the Bay Area that do delivery of whatever the chefs wanted to make that day--Sprig is the one I'm most familiar with. In many cities, there are lots of street vendors and food trucks, that will typically sell either just one thing or a handful of related things. (Think a hot dog vendor.)

It seems to me like this is roughly the world we already live in--if you want to get a pizza delivered, there are people who make lots of pizzas and very little else waiting to send you a pizza. To increase efficiency more we need to be poorer: instead of you deciding that you want pizza, it is decreed that it is Taco Tuesday and everyone is eating tacos. (This is comparable to Hanson's claim that we could have a lot more things if we had a lot fewer varieties of things.)

Are you only interested in solid food or would you want to buy Soylent/Joylent as well? Soylent/Joylent and Meal Squares are so simple that you wouldn't need new restaurants. They could easily be sold at, say, Starbucks.

On a related note, drinking Joylent has improved my feeling of well-being more than anything else I've done. The low price is just an added bonus.

This makes me think of Little Caesars pizza. They have a variety of pizza-place-type of stuff on their menus (hot wings, breadsticks, etc), but I wouldn't be surprised to find if 90% or more of their business was their $5.00 14-inch pepperoni pizza.

Around here (midwest USA), during prime pizza-buying hours, they set up a card table outside stacked with dozens of pizzas and people just drive by with a $5 bill out and grab a pizza.

The big pizza delivery chains have expanded their menus over time, from pretty-much-pizza to sandwiches, desserts, wings, salads, etc.

So it seems efficiency is not the driver.

Sometimes, I think people can substitute 2 meals with 1 large portion of borsch:) I used to fantasize about conquering the un-Borsch-ed countries with it:) it's basically a soup of <=20 kinds of vegetables&fruit prepared usually on meat stock, which can be put into the fridge and grows mellower after a day or two. However, it is rather a long recipe and so the typical restaurant version always seems abriged.

I've only been able to find one example of an establishment that actually does this. Ugi's, an Argentinian pizza chain, sells 12-inch (?) cheese pizzas for about 4.91 USD in Buenos Aires.

Given that Argentinia is on the metric system why should they have 12-inch pizza's?

I'm going to agree with the observation that "make food production more efficient by making only one type of food" isn't a likely winner for restaurants.

If you're really trying to optimize for the economic efficiency with which food is produced, you don't make hot fresh-cooked food in the first place; you make food on assembly lines and package it. At which point the incremental cost of using preservation techniques and selling it on supermarket shelves is minimal- and all you're sacrificing is flavor and the health of the food... and people who are trying to optimize for 'cheapness' in their food tend to not care about that.

This is not a likable conclusion, perhaps. But it's definitely the one supported by the evidence of what market economies with plenty of access to information for all parties actually DO.

Now... yes, in an imaginary world where handwavium drone-robots make it possible to deliver anything you want for free and never mind the logistical implausibilities (i.e. that of Yudkowsky's "dath ilan"), a situation where you order three different foods from three different vendors who all specialize in that exact food might work.*

In a world where you have to go TO the location of your food, or where there is ANY significant extra cost associated with making three smaller transactions over one big one, it's a non-starter.

*Although even then you still need room for customization- a pizza place that literally refuses to make pizzas with more than one topping combination will usually lose out to a pizza place that lets you pick your toppings.

The Aldi's chain of grocery stores takes a similar approach. They promise to do less: fewer products, fewer brands (often 1 for a product), fewer hours, lower prices.

There might be issues with allergies. Can you have a restaurant that simply refuses service to people who are allergic to the one item on the menu?

Do you count "restaurants" that make the one meal, package it, freeze it, and distribute it to grocery stores?