Read the section "modern economies are big and complex." which sentence from the section explains what kinds of services modern economies provide? group of answer choices developing countries do this if they don't have the technology to make them into finished products developed countries have modern economies. modern economies are more complex. this includes retail, banks, hotels, real estate, education, health care, computer services, recreation, media and communications. to measure the gni, first add up the total value of its goods and services in a country. then divide that by the number of people.