Dropping diversity of products of large US firms: Models and measures

It is widely assumed that in our lifetimes the products available in the global economy have become more diverse. This assumption is difficult to investigate directly, however, because it is difficult to collect the necessary data about every product in an economy each year. We solve this problem by mining publicly available textual descriptions of the products of every large US firms each year from 1997 to 2017. Although many aspects of economic productivity have been steadily rising during this period, our text-based measurements show that the diversity of the products of at least large US firms has steadily declined. This downward trend is visible using a variety of product diversity metrics, including some that depend on a measurement of the similarity of the products of every single pair of firms. The current state of the art in comprehensive and detailed firm-similarity measurements is a Boolean word vector model due to Hoberg and Phillips. We measure diversity using firm-similarities from this Boolean model and two more sophisticated variants, and we consistently observe a significant dropping trend in product diversity. These results make it possible to frame and start to test specific hypotheses for explaining the dropping product diversity trend

Actions of Non-steroidal Anti-Inflammatory Drugs in Sheep

Mechanical and thermal stimuli were used to determine threshold responses in normal experimental sheep which were familiar with both test procedures. The average control response threshold to noxious thermal and mechanical stimulation was 54.

Study in labor administration

Thesis (B.A.)--University of Illinois, 1920.Typescript.Cover title: "A study in labor administration".Includes bibliographical references (leaves [69]-[71])

My Good Friend

Please note: creative writing theses are permanently embargoed in OpenBU. No public access is forecasted for these. To request private access, please click on the lock icon and fill out the appropriate web form.Kat is a newly sober, punk rock writer who is still mourning the death of her first love. Geoffrey is older, married, and high on life after surviving stage four cancer. They meet at a retreat center in Big Sur, California, and enter into a passionate, "ethically non-monogamous" relationship. However, once Kat meets Clem, Geoffrey's beautiful, ambitious wife, she starts to question her arrangement with Geoffrey. As she becomes more entangled in Geoffrey and Clem's marriage, Kat must decide whose story to believe and whose secrets to keep.2999-01-01T00:00:00