NATIONAL BUREAU OF ECONOMIC RESEARCH
NATIONAL BUREAU OF ECONOMIC RESEARCH

NBER Publications by Steven Tadelis

Contact and additional information for this authorAll NBER papers and publicationsNBER Working Papers only

Working Papers and Chapters

May 2014Consumer Heterogeneity and Paid Search Effectiveness: A Large Scale Field Experiment
with Tom Blake, Chris Nosko: w20171
Internet advertising has been the fastest growing advertising channel in recent years with paid search ads comprising the bulk of this revenue. We present results from a series of large scale field experiments done at eBay that were designed to measure the causal effectiveness of paid search ads. Because search clicks and purchase behavior are correlated, we show that returns from paid search are a fraction of conventional non-experimental estimates. As an extreme case, we show that brand-keyword ads have no measurable short-term benefits. For non-brand keywords we find that new and infrequent users are positively influenced by ads but that more frequent users whose purchasing behavior is not influenced by ads account for most of the advertising expenses, resulting in average returns that ...
August 2007Contracting for Government Services: Theory and Evidence from U.S. Cities
with Jonathan Levin: w13350
Local governments can provide services with their own employees or by contracting with private or public sector providers. We develop a model of this "make-or-buy" choice that highlights the trade-off between productive efficiency and the costs of contract administration. We construct a dataset of service provision choices by U.S. cities and identify a range of service and city characteristics as significant determinants of contracting decisions. Our analysis suggests an important role for economic efficiency concerns, as well as politics, in contracting for government services.

Published: CONTRACTING FOR GOVERNMENT SERVICES: THEORY AND EVIDENCE FROM U.S. CITIES† JONATHAN LEVIN1, STEVEN TADELIS2 Article first published online: 3 SEP 2010 DOI: 10.1111/j.1467-6451.2010.00430.x

February 2006Bidding for Incomplete Contracts: An Empirical Analysis
with Patrick Bajari, Stephanie Houghton: w12051
Procurement contracts are often incomplete because the initial plans and specifications are changed and refined after the contract is awarded to the lowest bidder. This results in a final cost to the buyer that differs from the low bid, and may also involve significant adaptation and renegotiation costs. We propose a stylized model of bidding for incomplete contracts and apply it to data from highway paving contracts. Reduced form regressions suggest that bidders respond strategically to contractual incompleteness and that adaptation costs, broadly defined, are an important determinant of the observed bids. We then estimate the costs of adaptation and bidder markups using a structural auction model. The estimates suggest that adaptation costs on average account for about ten percent of th...

Contact and additional information for this authorAll NBER papers and publicationsNBER Working Papers only

 
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