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Hello! I’m Si ZUO 左思

How to say my name?   See Zoo-oh

I am a fourth-year Ph.D. in Strategy and Business Economics, SC Johnson Graduate School of Management & Economics Department, Cornell University. 

My research interests are industrial organization and quantitative marketing. Specifically, I am interested in platform, online retailing, and algorithms​​ I use casual inference, structural estimation, machine learning, and game theory model for my research. 


I am passionate about teaching and am the course designer/lead instructor of Cornell Johnson NBA 6955 Industrial Organization, Consulting, and Business Strategy in Fall 2022.


Phd in Economics, Cornell University

September 2019 - present

MS in Economics, Hong Kong University of Science and Technology, Hong Kong

September 2018 - June 2019

BS in Economics, Sun Yat-sen University, Guangzhou, China

October 2014 - June 2018


Working Paper & Work in Progress

Covered by South China Morning Post. Presented at International Industrial Organization Conference (2022, Boston), North America SummerMeeting (2022, Miami), Asia-Pacific Industrial Organization Conference (2021, NUS)


To build a reputation on online platforms, new firms need to accumulate reviews through sales and consider the corresponding pricing strategy. We construct a dynamic model with both price signaling and a review-based reputation system. A high-quality firm can signal its unobserved quality by setting a lower introductory price than that of a low-quality firm because the high-quality firm benefits more from accumulating reviews in early periods. Using data from Zaihang, a service platform, we find empirical evidence that experts with high unobserved ability indeed adopt low introductory prices. We use an expert's performance on another platform as an instrument for the expert's ability to provide evidence for the causal relationship. The price and sales dynamics in the data are also consistent with the model predictions. The platform can accelerate quality revelation by facilitating price signaling. To do so, platforms could make price comparison easier and provide training to new firms about signaling.

Stores Going Online: Market Expansion or Cannibalization? , with Yangguang Huang (HKUST) and Chenyang Li (Cornell)

With the rise of e-commerce, more and more chain stores have opened online sales channels. For one chain, there are usually one online store and many offline stores. Online stores may cannibalize the sales of the existing physical stores because of their advantage in lower shopping costs. On the other hand, the online sales channel is usually a tool for advertisement, which may expand the offline store's market. From our novel daily revenue data of 380 offline stores from 2016 to 2020, we identify the countervailing cannibalization effect and the informative effect of opening up online branches on offline stores. We first use exogenous demand shocks (weather, Covid-19, and online shopping festivals) to provide solid evidence of these two effects. We then separately estimate these two effects by a structural model. We find that the cannibalization effect dominates the informative effect in most cases. The electronics category has the largest cannibalization effect, while the cosmetics and jewelry category has the smallest.

Bundling Promotion on Online Platforms, with Vrinda Kadiyali (Cornell) and Young-hoon Park (Cornell)

Consumer Learning in the Presence of Personalized Recommendations, with Omid Rafieian (Cornell)



NBA 6955 Industrial Organization, Consulting and Business Strategy                                                                                               Fall 2022
Course Page     Syllabus

MBA Elective Course (also open for Graduates), Course Designer, and Lead Instructor.
32 students enrolled, Evaluation 4.4/5. 
SC Johnson Graduate School of Management, Cornell University.

Industrial Organization Research Workshop  Syllabus                                                                                                                       Winter 2022

CICER Winter Camp for Undergraduates, Cornell Institute for China Economic Research, Cornell University.

Teaching Assistant

MBA Courses

AI for Marketing Strategy  (with Lab Sessions), MBA Elective Course, for Prof. Emaad Manzoor, SC Johnson, Cornell University.

                                                                                                                                                                                                                           Spring 2023

Data Analysis and Modeling (with Sessions), MBA Core Course, for Prof. Omid Rafieian, SC Johnson, Cornell University.

                                                                                                                                                                                                                       Summer 2022              

Microeconomics for Management, MBA Core Course, for Prof. Yi Chen & Prof. Michael Waldman, SC Johnson, Cornell University.        

             Summer 2021 & Fall 2020

Strategy, Cornell-Tsinghua Finance MBA Core Course,  for Prof. Thomas Jungbauer, SC Johnson, Cornell University.                       

    Winter 2021 & Spring 2021

Ph.D. Courses

Applied Microeconomics II: Game Theory, Ph.D. Core Course, for Prof. Michael Waldman, Dyson School of Applied Economics and Management, Cornell University.                                                                                                                                                                 Spring 2022

Microeconomics Theory I (with Sessions), Ph.D. Core Course, for Prof. David Easley, Economics Department, Cornell University.     

                                                                                                                                                                                                                                 Fall 2021

Guest Lecturer

Conversations in Business Analytics                                                                                                                                                      Winter 2022
MS in Business Analytics Core Course, 
SC Johnson Graduate School of Management, Cornell University.

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