Post-1970 — The FLD does not appear in The Profit Magic of Stock Transaction Timing (1970). It was developed in the Cycles Course and Hickson / Sentient Trader tradition.
Definition
The Future Line of Demarcation (FLD) shifts a price series (often median price = (high + low) / 2) forward in time by roughly ½ wavelength of the analyzed cycle.
When price crosses the FLD, the event is an action signal (buy or sell depending on context and cross direction).
FLD vs VTL (1970 book)
| Tool | Origin | Logic |
|---|---|---|
| VTL | Profit Magic Ch. 4 | Break of trend line between consecutive peaks/troughs |
| FLD | Cycles Course | Temporal shift by half period |
Both can produce action signals in the post-course tradition.