Head to www.bls.gov and select Multifactor Productivity from the Subject drop-down menu. Scroll down and select the PDF version of the Preliminary Multifactor Productivity Trends, 2013 . Do your best to answer the following questions. What has been the general trend for multi-factor productivity in the U.S. over the past twenty years? What does this trend suggest has happened to production functions in the U.S.? Assuming this change in productivity has happened to all firms, how will this change in productivity affect cost curves? Solution 1 multi-factor productivity trends in the four industries, that is output divided by total factor input at time t, For petroleum, the multi-factor productivity trend is very similar to the labor productivity trend. That is, productivity declines steadily to only 33% of the 1970 level by the early 1980 .