Can You Trust This Bounce? A Fibonacci Tip for Big One-Day Drops

Whether to trust the bounce, in one line

If a post-drop bounce stalls at and below the 50% retracement, I read it as a short-term bearish tell.

The market has bounced for two straight sessions. On Friday the S&P fell more than 2% in a day, and the rebound followed. Honestly, the bounce itself wasn't surprising. Across 199 occurrences I studied in a backtest tool, the average return after a 2%+ single-day drop was about 0.37% the next day and roughly 0.58% a week out. This time SPX closed up about 0.75% — almost exactly in line with those historical averages.

The real question is what comes next. Is this bounce a continuation toward new highs, or bait for a deeper move down?

The Fibonacci tip I lean on

The trick is to draw a Fibonacci retracement on a single big drop candle.

It's simple. Pull a retracement from where the large drop started (the candle high) to where it ended (the low). Several levels populate the chart, and I focus on the 50% and 61.8% zones, because that's where buyers and sellers psychologically collide.

The logic is intuitive. After a big drop, if price quickly recaptures 50% or more of the move, people start feeling better fast. But if sellers say "not so fast" and pin price at or beneath the 50% retracement, I'd argue that looks more bearish in the short term.

This time, the S&P turned around intraday right at the 50% retracement — to the tick. It rejected the 50% level. That carries weight.

The level to watch today

Drop to the 4-hour chart for a cleaner read. Using Friday's drop, I draw the 50% retracement and treat it as today's key level.

• A decisive close above the 50% retracement tilts the odds bullish.
• A more conservative read waits for a break and close above the 61.8% retracement.

If either confirms, I think the most likely scenario is the bulls carrying demand into this week's big events. If instead the bounce rolls over and breaks the lows, technically there's more room to pull back.

Why this week matters so much

The calendar is a volatility minefield: CPI Wednesday morning, PPI Thursday, and a record-setting IPO valued near $2 trillion on Friday. For index traders, any of the three can be the trigger that breaks or holds these levels.

So I won't conclude "it bounced, therefore up." How price handles the 50% and 61.8% levels is what tells me the direction.

FAQ

Q: Why only the 50% and 61.8% levels? A: Those are where buying and selling psychology collide hardest after a drop. Reclaiming 50% spreads relief quickly; getting pinned below it signals sellers have the edge.

Q: Isn't a bounce matching historical averages a good sign? A: It only means the size of the bounce is normal — it doesn't guarantee the trend will continue. That's why I watch where it stalls, not how big it is.

Q: Does this only work on indices? A: No. You can apply it to any chart that just printed a big one-day drop. Just remember that in an event-heavy week, technical levels can get overridden quickly.