Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Do Firearm Markets Comply with Firearm Restrictions? How the
  Massachusetts Assault Weapons Ban Enforcement Notice Changed Firearm Sales   How well do firearm markets comply with firearm restrictions? The
Massachusetts Attorney General issued an Enforcement Notice in 2016 to announce
a new interpretation of the key phrase "copies and duplicates" in the state's
assault weapons ban. The Enforcement Notice increased assault rifle sales by
1,349 (+560%) within five days, followed by a reduction of 211 (-58%) over the
next three weeks. Assault rifle sales were 64-66% lower in 2017 than in
comparable earlier periods, suggesting that the Enforcement Notice reduced
assault weapon sales but also that many banned weapons continued to be sold.

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The categories of this paper are: cs
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The categories of this paper are: atom-ph
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The categories of this paper are: math
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The categories of this paper are: physics
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The categories of this paper are: funct-an
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The categories of this paper are: chao-dyn
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The categories of this paper are: cond-mat
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The categories of this paper are: nlin
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The categories of this paper are: math-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: bayes-an
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The categories of this paper are: nucl-ex
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The categories of this paper are: nucl-th
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The categories of this paper are: stat
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The categories of this paper are: comp-gas
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The categories of this paper are: gr-qc