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Key Links in Network Interactions: Assessing Route-specific Travel Restrictions in China during the Covid-19 Pandemic

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  • Chen, Xi
  • Qiu, Yun
  • Shi, Wei
  • Yu, Pei

Abstract

We consider a model of network interactions where the outcome of a unit depends on the outcomes of the connected units. We determine the key network link, i.e., the network link whose removal results in the largest reduction in the aggregate outcomes, and provide a measure that quantifies the contribution of a network link to the aggregate outcomes, which complements the intercentrality measure of the key network node proposed by Ballester, Calv'o-Armengol, and Zenou (2006). We provide an example examining the spread of Covid-19 in China. Travel restrictions were imposed to limit the spread of infectious diseases. As uniform restrictions can be inefficient and incur unnecessarily high costs, we examine the design of restrictions that target specific travel routes. Our approach may be generalized to multiple countries to guide policies during epidemics ranging from ex ante route-specific travel restrictions to ex post health measures based on travel histories, and from the initial travel restrictions to the phased reopening.

Suggested Citation

  • Chen, Xi & Qiu, Yun & Shi, Wei & Yu, Pei, 2022. "Key Links in Network Interactions: Assessing Route-specific Travel Restrictions in China during the Covid-19 Pandemic," GLO Discussion Paper Series 1030, Global Labor Organization (GLO).
    • Handle: RePEc:zbw:glodps:1030
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    More about this item

    Keywords

    network interactions; key network links; Covid-19; transmission;
    All these keywords.

    JEL classification:

    • C21 - Mathematical and Quantitative Methods - - Single Equation Models; Single Variables - - - Cross-Sectional Models; Spatial Models; Treatment Effect Models
    • I18 - Health, Education, and Welfare - - Health - - - Government Policy; Regulation; Public Health
    • D85 - Microeconomics - - Information, Knowledge, and Uncertainty - - - Network Formation
    • H75 - Public Economics - - State and Local Government; Intergovernmental Relations - - - State and Local Government: Health, Education, and Welfare

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