> "how do I sleep on an airplane". Isn't a neck travel pillow an appropriate result here?

Late to the party, but I want to say here the answer is "maybe". However, the idea that the solution to every problem or need is to buy something is pretty regressive and is kind of at the core of the problem with consumerism and rapacious capitalism.

For a person to buy something, that something has to have been manufactured, shipped, sold, shipped again, etc. All that is extractive and depends on externalities that are too-often finite.

Also, the person buying has to have money, which they made through some kind exchange for labor, possibly fairly, possibly not. For capitalism, incentivizing people to treat a want or need as an opportunity for a financial transaction is essential, even when there are other solutions. Remember, for example, that the Listerine company essentially "invented" bad breath as a problem requiring a product to solve. Not that people didn't legit deal with bad breath before, just that they weren't sold a pre-packaged "cure".

So the question "how do I sleep on an airplane" has many answers other than "buy something".