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Modulation Index is the ratio of the maximum deviation frequency to the frequency of modulation. In other words it is the ratio of the spread in frequency spectrum to the frequency that was used to modulate the carrier. For FM, modulation index is given by the formula mf= df/f where, mf=modulation index for FM df=difference in carrier frequency f=frequency of the signal
Barclays acquired the Lehman index business in November 2008 and rebranded it to their own name. So the Lehman Global Aggregate index is now the Barclays Global Aggregate index. While it is certainly possible that they will adjust their methodology in the future, is is the same index, and the returns prior to the transition are unaffected.
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By the amount of time:)
fc>2fm
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