The most economical printer to use is one that its ink has a reasonable cost, and it uses little ink to print. The ink for cheap printers tends to be expensive for the long haul thus making expensive printers more economical to use for people who regularly print.
However, it all depends on what a person prints, how much they print and how long the printer can last. For bulk printing, it is wise to get a more expensive printer to save on the cost of ink. The cost of printing plain text documents and colored documents tend to be high with cheaper printers. They also have high ink consumption thus a person will need to buy ink regularly.