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. 2021 May 27;23(6):673. doi: 10.3390/e23060673

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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Comparison of the network response (dashed lines, left vertical axis) with the Covid-19 positivity rates in the U.S. (solid line, right vertical axis). The network response is shown as a projection in the (z,t) plane of Figure 10 and is indexed relative to the March 2020 output levels. The dates of signing the three U.S. stimulus packages are indicated: the CARES Act—27 March 2020, Consolidated Appropriations Act—21 December 2020, and American Rescue Plan Act—11 March 2021. Covid-19 positive testing data provided by the Center for Disease Control and Prevention (CDC).