Alternatively weighted and Factor indices do much more than measure and inform.When you select an ETF or other passive investment fund to access emerging markets, it is important to understand the index on which it is based. An index helps define the risk exposure of your fund. It helps to determine what the fund actually invests in and the performance you can expect. Not all indices are created equal.A good index must comprehensively represent the market it is designed to reflect. It should be based on objective and fully transparent rules so that users understand what it is really measuring. And it must clearly and accurately represent the exposure you are looking for: if you want factor exposure, for example, choose the appropriate factor index that was designed specifically to capture that exposure.

Airlines go into reverse after London airspace problems, as FTSE slumps | Business | The Guardian

Some 41bn was wiped off the value of the leading index, making a loss of 112bn for the week. The index closed down 161.07 points or 2.49% lower at 6300.63, close to its lowest level of the day, with commodity stocks among the main fallers. But following the latest Ofwat ruling on prices, which was in line with expectations, United Utilities rose 31p or 3.5% to 903p, with analysts saying the judgement was unlikely to put financial strain on the business. Severn Trent added 22p to 19.37. There were only two other risers in the leading index. J Sainsbury edged 1.2p higher to 227.5p on recovery hopes, while pump maker Weir was up 4p at 16.99 after Canaccord Genuity moved from hold to buy. Airline shares made early gains on the prospect of lower fuel costs, but air traffic control problems over London sent them into reverse by the close of play. British Airways owner International Airlines Group ended 5.2p lower at 456.8p while easyJet was down 28p at 16.40. Petrofac fell 46p to 678p as the oil service group continued to be undermined by the falling crude price. Royal Dutch Shell A shares lost 70.5p to 2031.5p while BHP Billiton fell 36p to 13.25. Among the mid-caps power group Drax dropped 56p to 508.5p as the government announced a change to a subsidy scheme for biomass plants.

FTSE 100 reeling from £112bn slump | Herald Scotland

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The sell-off also covered the retail sector after Next dropped 160p to 6385p and Dixons Carphone slipped 14.3p to 421.6p. Insurer Aviva was down 4% after insurance analyst Eamonn Flanagan of Shore Capital Stockbrokers reiterated his sell rating and warned the company's acquisition of Friends Life presented a significant "execution risk" due to the plethora of companies, systems and products which have to be integrated. The shortened risers board was led by water companies after the industry regulator Ofwat told firms to cut household bills in real terms by 5% over the next five years. The decision confirms a provisional determination in August and was met with relief by investors in Severn Trent and United Utilities as the pair's shares rose 22p to 1937p and 31p to 903p. Investec analyst Roshan Patel said the final determination by Ofwat gave a "balanced outcome" for shareholders. Outside the top flight, shares in Hargreaves Services slumped 13% after it announced the closure of its Monckton coke works and said the outlook for its surface coal mining operations had been hit by falling prices.