Horizontal agreement

Arrangement between actual or potential competitors, that is, undertakings operating at the same level of the production or distribution chain, covering, for example, research and development, production, purchasing or commercialisation. Horizontal agreements may...

Herfindahl-Hirschmann Index (HHI)

Specific measurement of market concentration, that is, of the extent to which a small number of firms account for a large proportion of output. The HHI is used as one possible indicator of market power or competition among firms. It measures market concentration by...

Hearing officer

An independent senior official who is charged with organising hearings and with ensuring that they are properly conducted. The hearing officer thus contributes to the objectivity of the hearing itself, the observance of due process, the respect of the parties’ rights...

Positive Comity

By positive comity, a country may ask the other parties to the agreement to take appropriate measures, under their competition law, against anti-competitive behaviour taking place on their territory that affects important interests of the requesting country. Source:...

Negative Comity

Every country that is party to a cooperation agreement guarantees to take account of the important interests of the other parties to the agreement when applying its own competition law. See comity, positive comity. Source: Glossary of terms used in EU competition...