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Boats carrying tourists sail on the Lijiang River in Guilin, Guangxi Zhuang autonomous region, in October. The picturesque scenery has made the city a popular tourist attraction. ZHANG AILIN/XINHUA

Boeing faces major technical and public relations problems as it prepares for this week's hearing of US House of Representatives subcommittee on the status of the 737 Max airliner.

Both Embraer's E-Jets, which generally range between 70 and 130 seats, and to a greater extent Bombardier's C Series, overlap at the margins of the big-airplane portfolios of Airbus and Boeing, but the products are mainly seen as complementary. Boeing and Airbus' smaller planes start at around 125 seats.

Both Lai and David-Experton agree that for popular artists, brand endorsement deals would probably be the most lucrative revenue of all.

Bogle did not invent the index fund, but he expanded access to no-frills, low-cost investing in 1976 when Vanguard introduced the first index fund for individual investors, rather than institutional clients.