What are the factors affecting the demand for a commodity?

Used cars usually have options: higher depreciation rate than new cars lower financing costs than new cars lower insurance premiums than new cars lower maintenance costs than new cars

Job 456 was recently completed. the following data have been recorded on its job cost sheet: direct materials $ 2,418 direct labor-hours 74 labor-hours direct labor wage rate $ 13 per labor-hour machine-hours 137 machine-hours the corporation applies manufacturing overhead on the basis of machine-hours. the predetermined overhead rate is $14 per machine-hour. the total cost that would be recorded on the job cost sheet for job 456 would be: multiple choice $3,380 $5,298 $6,138 $2,622

Google started as one of many internet search engines, amazon started as an online book seller, and ebay began as a site where people could sell used personal items in auctions. these firms have grown to be so large and dominant that they are facing antitrust scrutiny from competition regulators in the us and elsewhere. did these online giants grow by fairly beating competition, or did they use unfair advantages? are there any clouds on the horizon for these firms -- could they face diseconomies of scale or diseconomies of scope as they continue to grow? if so, what factors may limit their continued growth?