19) which factor might cause an increase in the supply of a product? a) a decrease in productivity b) fewer sellers in the marketplace c) the introduction of new technology d) an increase in the cost of raw materials

What is the main difference between primary and secondary sources? a. primary sources are historical documents, and secondary sources are modern-day documents. b. primary sources are derived from museums and archives, and secondary sources are created by history students and academics. c. primary sources are found in ancient places with a rich history, and secondary sources are found in historical journals and blogs. d. primary sources are created during a particular historical era, and secondary sources are created by studying primary sources.