HHI-Methods {antitrust}

Methods For Calculating the Herfindahl-Hirschman Index

Description

Computes the Herfindahl-Hirschman Index (HHI) using simulated market shares and either pre- or post-merger ownership information. Outside shares are excluded from the calculation.

Usage

## S4 method for signature 'Bertrand'
hhi(object, preMerger = TRUE, revenue = FALSE, insideonly = TRUE)

## S4 method for signature 'Cournot'
hhi(object, preMerger = TRUE, revenue = FALSE)

## S4 method for signature 'VertBargBertLogit'
hhi(object, preMerger = TRUE, revenue = FALSE, insideonly = TRUE)

Arguments

object

An instance of one of the classes listed above.

preMerger

If TRUE, returns pre-merger outcome. If FALSE, returns post-merger outcome. Default is TRUE.

revenue

If TRUE, returns revenues. If FALSE, returns quantities. Default is TRUE.

insideonly

If TRUE, excludes the share of the outside good from the calculation. Default is TRUE.