After eight consecutive weeks of gains, it is time to consider when strength becomes exhaustion in the stock market.
Overbought Eventually Means Overbought
SPDR S&P 500 (NYSE: SPY)
closed up 0.11% in a holiday-shortened trading week. This was the
eighth time in a row SPY posted a weekly gain. It was also the smallest
weekly gain in the winning streak and the second week in a row the rate
of change has declined.
The
concept of overbought is a challenging one, and traders have spent
countless hours trying to understand it. Many indicators, such as stochastics and Relative Strength Index (RSI),
are used to define an overbought market, but they all share a common
flaw. At the beginning of a very strong up move, markets become
overbought and stay overbought.
The chart below demonstrates the
challenge of defining when a market is overbought. SPY is shown with the
stochastics indicator. The monthly chart is used to decrease the
sensitivity of the indicator, but similar patterns can be seen on weekly
and daily charts.
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