But if they're thinking longer - term, they don't want to get a reputation as an index provider that makes arbitrary changes to suit their ETF providers. (moneysense.ca)
Unlike the Basic Portfolio service in which the membership of the portfolio is predetermined and only subject to periodic rebalancing over the analysis period, the DPA allows for arbitrary changes in portfolio composition. (alpholio.com)
These are arbitrary changes which in no way reflect the work of students and teachers and are clearly unfair.» (bbc.co.uk)