Glencore said China is reviewing its proposed merger with Xstrata with a focus on whether the combined company would exert too much influence on China's copper market.

WSJ: What's News

Mom was distressed when we returned from these outings, having in our absence awoken to the possibility that Fred might exert a stronger influence over her boys than she did and that we too would then be lost to her.

NPR: Excerpt: 'Trauma'

Anti-trust law is of course based on the idea that some companies can grow too large, and in doing so, might be able to exert economy-sapping control over markets for certain goods.

FORBES: Magazine Article