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Finance Lesson 8 done.
You can compute a moving average, see why it lags, find a golden cross, measure what the lag costs and spot a whipsaw. And you saw the same signal work and fail. Next in technical analysis: RSI and momentum.
What you're learning
A moving average is the average of the last N closing prices, recalculated every day. The 50-day shows the recent trend; the 200-day, the long one. Both lag : they're made of past prices.
A golden cross is the 50-day rising above the 200-day; a death cross , falling below. Traders read them as trend changes. They come late, and when the lines run flat they can flip back and forth (a whipsaw ).
Prices are Apple's real daily closes (Yahoo Finance, not dividend-adjusted); every average and cross is computed from them. Charting sites that use adjusted prices can show slightly different values. Educational content, not investment advice.