Once we have time travel, entrepreneurs will set up shops/restaurants in specific places and times.
For instance, I might start a record store in Seattle in the 90’s. And I’d advertise in the Space/Time Yellow Pages. My hours of operation would be 9 am to 9 pm, Monday thru Saturday, 1988 to 1994. As a time traveler, I would go back to 1988 and set up my store. And I’d live in Seattle until 1994, at which point I would close the store and travel back to my own time. Consumers from all points in the future could find my store in the Space/Time Yellow Pages, go back in time to when it was open, and shop.
Or, let’s say one of my ancestors owned a restaurant in the 60’s. As their descendent, I would advertise the restaurant in the Space/Time Yellow Pages (open for dinner 7 nights a week, 1963 to 1968). Then, future consumers would go back in time to eat at my ancestor’s restaurant, and as their descendent, I’d earn a profit, which would appear in my inheritance.