Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Macroscopic properties of buyer-seller networks in online marketplaces   Online marketplaces are the main engines of legal and illegal e-commerce, yet
their empirical properties are poorly understood due to the absence of
large-scale data. We analyze two comprehensive datasets containing 245M
transactions (16B USD) that took place on online marketplaces between 2010 and
2021, covering 28 dark web marketplaces, i.e., unregulated markets whose main
currency is Bitcoin, and 144 product markets of one popular regulated
e-commerce platform. We show that transactions in online marketplaces exhibit
strikingly similar patterns despite significant differences in language,
lifetimes, products, regulation, and technology. Specifically, we find
remarkable regularities in the distributions of transaction amounts, number of
transactions, inter-event times and time between first and last transactions.
We show that buyer behavior is affected by the memory of past interactions and
use this insight to propose a model of network formation reproducing our main
empirical observations. Our findings have implications for understanding market
power on online marketplaces as well as inter-marketplace competition, and
provide empirical foundation for theoretical economic models of online
marketplaces.

10
The categories of this paper are: q-bio
22
The categories of this paper are: chao-dyn
33
The categories of this paper are: plasm-ph
14
The categories of this paper are: math-ph
15
The categories of this paper are: nucl-ex
2
The categories of this paper are: math
26
The categories of this paper are: bayes-an
30
The categories of this paper are: q-alg
24
The categories of this paper are: dg-ga
0
The categories of this paper are: hep-ph
16
The categories of this paper are: stat
11
The categories of this paper are: hep-lat
4
The categories of this paper are: cond-mat
5
The categories of this paper are: gr-qc
29
The categories of this paper are: funct-an
32
The categories of this paper are: atom-ph