Sectors
are further divided into subsectors (same as industries). For example, Oil is a sector while Oil
Exploration and Oil Service are industries. Industries cover a very specialized
segment of the sector, so they are more volatile. The ETF for an industry has
less companies than the ETF for the entire sector. Some industry ETFs are too small,
and more profitable at higher risk.
SeekingAlpha.com has a good
performance summary for sectors including countries and industries. Select the
best ETF from the last month, use stop loss to protect momentum reversal and switch
when there is a better sector or industry to buy. Aggressive investors can also
short an ETF or buy contra ETFs for the worst performed sectors or industries.
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