Is every back-adjusted historical level an exact tradable price from that date?
Reveal the worked answer
No.
Later adjustment may have shifted it.
Equity Index Futures · FUT-18 · Core
Continuous charts
Which historical price was actually tradable?
What you will learn and prerequisites
- Explain the mechanism in the lesson question.
- Reproduce the worked comparison and recognize its failure case.
Read first: What is an equity index future?
A continuous chart joins contracts into an analytical series. Back adjustment can remove roll gaps by shifting older history; unadjusted stitching preserves raw prices but leaves discontinuities. Neither is one contract that traded forever.
The chart methodology affects indicators and apparent reference levels.
Understand the mechanism
Back-adjusted historical levels may differ from the prices printed by the actual contract at that date. Ratio adjustment has another effect. These methods can be useful, but their purpose must be declared.
Actual orders and reconstructible P/L require the real symbol, timestamp and quote.
Walk through the process
Use known continuous-data methodology for historical analysis. Use actual contracts and explicit roll transactions for execution and performance. Include fees and avoid capturing a synthetic join as a tradable move.
Do not mix adjusted historical entries with unadjusted current exits in one profit calculation.
Operational boundary
All figures are fictional teaching inputs, not current quotes or margin schedules. Product rules, broker requirements and usable liquidity remain separate from the model example. A planned exit and an algebraic hedge are not execution guarantees.
A worked example
The near future ends at 5,000 and the next begins at 5,025. A raw stitch jumps 25. A simple back adjustment adds 25 to prior history, smoothing the join.
An old entry at 4,980 then displays as 5,005, but the actual account fill remains 4,980. The graph shows raw values; the text explains why changing the display does not rewrite cash history.
Continuous charts—worked comparison
Vertical: Raw contract quote
Horizontal: Contract history and roll stage
1. Fictional example
Read the graph as a data table
| Contract history and roll stage | Fictional example |
|---|---|
| 1 | 4,980 |
| 2 | 5,000 |
| 3 | 5,025 |
| 4 | 5,030 |
What would invalidate the reading?
A backtest can earn fictional rollover profits or use stop prices never quoted in the actual month if adjustment is ignored.
Check your understanding
Try the question before revealing its answer. These are reading checks, not trading certification or a site completion record.
What is the critical failure to avoid?
Reveal the worked answer
A backtest can earn fictional rollover profits or use stop prices never quoted in the actual month if adjustment is ignored.
Explain this risk before treating the example as a decision rule. A correct calculation does not guarantee a favorable market outcome.
Return to the question: Which historical price was actually tradable? State the observed facts, the assumptions and the failure condition separately.
Sources, assumptions and downloadable script
External references support definitions and conventions. Worked scenarios and prose are original. No current quotes or dealer inventory are claimed.
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