Table 4.

Diff-in-diff estimation of the impact of Covid-19 crisis on port throughput, depending on the network characteristics of ports (clustering coefficient and weighted degree).

	Whole world
	Spec. 1	Spec. 2	Spec. 3	Spec. 4	Spec. 5
	(1)	(2)	(3)	(4)	(5)
Covid	−0.191***	−0.193***	−0.191***	−0.196***
	(0.045)	(0.045)	(0.045)	(0.047)
Covid*Clustering	0.237***	0.240***	0.238***	0.238***	0.271***
	(0.077)	(0.077)	(0.078)	(0.078)	(0.094)
Covid*Weighted Deg.	0.337***	0.346***	0.328***	0.327***	0.232
	(0.105)	(0.106)	(0.106)	(0.107)	(0.199)
Observations	13,932	13,932	13,932	13,932	13,932
R-squared	0.013	0.015	0.055	0.055	0.282
Number of ports	647	647	647	647	647
Controls
FE port	X	X	X	X	X
FE year*port				X
FE season	X
FE season*continent		X
FE season*country			X	X
FE month*country					X

Robust standard errors in parentheses, ***p < 0.01, **p < 0.05, *p < 0.1.