//@version=6
indicator("Workshop 10 Price Per Bar", overlay=true)
anchor = input.time(timestamp("01 Jan 2026 00:00 +0000"),
    "Anchor time")
price = input.float(100.0, "Anchor price")
rate = input.float(1.0, "Price units per bar")
var int origin = na
if na(origin) and time >= anchor
    origin := bar_index
age = na(origin) ? na : bar_index - origin
guide = price + rate * age
plot(guide, "Declared rate", color=color.blue)
plot(price + 0.5 * rate * age, "Half rate",
    color=color.gray)
plot(price + 2.0 * rate * age, "Double rate",
    color=color.orange)