In just one month, from Nov. 11 to Dec. 10, the Shanghai B-share index soared 88%.

CNN: Business Investing

But with B-share holders calling the shots, such firms tend to underinvest, leading to lower sales growth and valuations than with single-share-class firms, according to a study by Harvard Business School's Paul Gompers, Stanford's Joy Ishii and Wharton's Andrew Metrick.

FORBES: Magazine Article

Typically, their A-class stock entitles owners to one vote per share while B-class bestows ten votes.

FORBES: Magazine Article

Typically, their A-class stock entitles owners to one vote per share, while B-class bestows 10 votes.

FORBES: Magazine Article

An open, healthy and honest change effort requires a conscious, compassionate, and caring focus on people a proactive, honest and organizationally-responsible effort that transcends logistics, politics, market share and all the other B-school and Wall Street Journal analytics that most change management efforts focus on, almost exclusively.

FORBES: Why Yahoo Will Start Telecommuting Again

B-shares leapt in price during September amid rumours that the government might allow the share classes to merge.

ECONOMIST: China's different share classes damage its own prospects

The government widened share ownership in April when it lifted bans on Chinese citizens buying US dollar denominated B-shares.

BBC: China's stock markets to let in foreign firms