Concept of productivity and factory production

Please explain the concept of productivity and factory production

and the importance of rising productivity for overall social welfare. In the presence of a monopoly in most industries, should we expect a fast rise in the standard of living? Why yes or why not? Please discuss.

Please explain the origins/backdrop of the rising standard of living and social welfare in the last 100 years. Is it good for consumers to buy products from an industry characterized by competition among sellers? What is the objective of consumers and why products sold in a perfectly competitive industry may help consumers attain their objective taking into consideration the constraints they are faced with?