diff --git a/FS25_ADSmartPickup/adPrices.lua b/FS25_ADSmartPickup/adPrices.lua
new file mode 100644
index 0000000..2756e36
--- /dev/null
+++ b/FS25_ADSmartPickup/adPrices.lua
@@ -0,0 +1,93 @@
+-- AD Prices
+-- Prisregel for udkørsel: hvor tæt er salgsstedets pris på årets toppris for varen?
+-- Toppris = stationens grundpris lige nu × (årets højeste periodefaktor ÷ nuværende periodes
+-- faktor) — dvs. det Priser-menuen ville vise som årets bedste måned for netop den station.
+-- Effektiv pris (inkl. prisfald efter salg og stor efterspørgsel) ÷ toppris = pris-%;
+-- stor efterspørgsel giver > 100 % og opfylder dermed altid reglen.
+-- De rene funktioner øverst har ingen spil-API; getQuote er spil-adapteren.
+
+ADPrices = {}
+
+ADPrices.LOG_PREFIX = "ADSmartPickup: "
+
+function ADPrices.maxFactor(factors)
+    local best = nil
+    for _, factor in pairs(factors or {}) do
+        if type(factor) == "number" and (best == nil or factor > best) then
+            best = factor
+        end
+    end
+    return best or 1
+end
+
+function ADPrices.topPrice(baseNow, factorNow, maxFactor)
+    if baseNow == nil or baseNow <= 0 then
+        return 0
+    end
+    if factorNow == nil or factorNow <= 0 or maxFactor == nil or maxFactor <= 0 then
+        return baseNow
+    end
+    return baseNow * maxFactor / factorNow
+end
+
+function ADPrices.percentOfTop(price, top)
+    if top == nil or top <= 0 or price == nil then
+        return 0
+    end
+    return math.floor(100 * price / top + 0.5)
+end
+
+-- Rigtige salgssteder: SellingStation der sælger (fabrikkers aflæsningsstationer er
+-- også SellingStation-objekter, men med isSellingPoint = false) og vises i Priser-menuen.
+function ADPrices.isSellingStation(station)
+    return station ~= nil and station.isa ~= nil and SellingStation ~= nil and station:isa(SellingStation) == true
+        and station.isSellingPoint == true and not station.hideFromPricesMenu
+end
+
+local function getCurrentPeriod()
+    local environment = g_currentMission ~= nil and g_currentMission.environment or nil
+    return environment ~= nil and environment.currentPeriod or nil
+end
+
+local function getDifficultyMultiplier()
+    local economy = g_currentMission ~= nil and g_currentMission.economyManager or nil
+    if economy ~= nil and economy.getPriceMultiplier ~= nil then
+        local ok, value = pcall(economy.getPriceMultiplier, economy)
+        if ok and type(value) == "number" then
+            return value
+        end
+    end
+    return 1
+end
+
+-- {price, top, percent} for varen ved stationen; nil hvis stationen ikke kan prissætte den.
+function ADPrices.getQuote(station, fillType)
+    if station == nil or station.getEffectiveFillTypePrice == nil then
+        return nil
+    end
+    local ok, effective = pcall(station.getEffectiveFillTypePrice, station, fillType)
+    if not ok or type(effective) ~= "number" then
+        return nil
+    end
+    local fillTypeDesc = g_fillTypeManager ~= nil and g_fillTypeManager.getFillTypeByIndex ~= nil and g_fillTypeManager:getFillTypeByIndex(fillType) or nil
+    local factors = fillTypeDesc ~= nil and fillTypeDesc.economy ~= nil and fillTypeDesc.economy.factors or nil
+    local period = getCurrentPeriod()
+    local factorNow = factors ~= nil and period ~= nil and tonumber(factors[period]) or 1
+    local baseNow = station.fillTypePrices ~= nil and tonumber(station.fillTypePrices[fillType]) or nil
+    if baseNow == nil or baseNow <= 0 then
+        baseNow = (fillTypeDesc ~= nil and tonumber(fillTypeDesc.pricePerLiter) or 0) * factorNow * getDifficultyMultiplier()
+    end
+    local top = ADPrices.topPrice(baseNow, factorNow, ADPrices.maxFactor(factors))
+    return {price = effective, top = top, percent = ADPrices.percentOfTop(effective, top)}
+end
+
+-- Højeste pris-%, ved lighed højeste pris. nil ved tom liste.
+function ADPrices.bestQuote(quotes)
+    local best = nil
+    for _, quote in ipairs(quotes or {}) do
+        if best == nil or quote.percent > best.percent or (quote.percent == best.percent and quote.price > best.price) then
+            best = quote
+        end
+    end
+    return best
+end
diff --git a/tests/test_adPrices.lua b/tests/test_adPrices.lua
new file mode 100644
index 0000000..ad2ec65
--- /dev/null
+++ b/tests/test_adPrices.lua
@@ -0,0 +1,65 @@
+-- Kør: luajit tests/test_adPrices.lua   (fra repo-roden)
+-- Prisregel: toppris fra årets prisforløb, pris-% pr. salgssted, bedste tilbud.
+
+dofile("FS25_ADSmartPickup/adPrices.lua")
+
+local failures = 0
+local function check(name, actual, expected)
+    if actual == expected then
+        print("OK   " .. name)
+    else
+        failures = failures + 1
+        print(string.format("FAIL %s: forventede %s, fik %s", name, tostring(expected), tostring(actual)))
+    end
+end
+
+-- P1: højeste faktor
+check("P1 maxFactor", ADPrices.maxFactor({EARLY_SPRING = 0.9, LATE_AUTUMN = 1.2, MID_SUMMER = 1.0}), 1.2)
+check("P1 uden faktorer = 1", ADPrices.maxFactor(nil), 1)
+
+-- P2: toppris = grundpris nu × (maks ÷ nu)
+check("P2 topPrice", ADPrices.topPrice(500, 1.0, 1.25), 625)
+check("P2 factorNow 0 -> grundpris", ADPrices.topPrice(500, 0, 1.25), 500)
+check("P2 grundpris 0 -> 0", ADPrices.topPrice(0, 1, 1.25), 0)
+
+-- P3: procent, afrundet; stor efterspørgsel > 100
+check("P3 75 %", ADPrices.percentOfTop(470, 625), 75)
+check("P3 112 %", ADPrices.percentOfTop(700, 625), 112)
+check("P3 top 0 -> 0", ADPrices.percentOfTop(1, 0), 0)
+
+-- P4: spil-adapter med stationens grundpris
+SellingStation = {}
+local SUGAR = 5
+g_fillTypeManager = {getFillTypeByIndex = function(_, index)
+    if index == SUGAR then return {economy = {factors = {A = 1.0, B = 1.25}}, pricePerLiter = 400} end
+end}
+g_currentMission = {environment = {currentPeriod = "A"}, economyManager = {getPriceMultiplier = function() return 1.0 end}}
+local station = {
+    fillTypePrices = {[SUGAR] = 500},
+    getEffectiveFillTypePrice = function(_, fillType) return 470 end,
+    isa = function(_, class) return class == SellingStation end,
+    isSellingPoint = true,
+}
+local quote = ADPrices.getQuote(station, SUGAR)
+check("P4 pris", quote.price, 470)
+check("P4 top", quote.top, 625)
+check("P4 procent", quote.percent, 75)
+check("P4 er salgssted", ADPrices.isSellingStation(station), true)
+check("P4 skjult = ikke salgssted", ADPrices.isSellingStation({isa = function() return true end, isSellingPoint = true, hideFromPricesMenu = true}), false)
+check("P4 fabrik-station = ikke salgssted", ADPrices.isSellingStation({isa = function() return true end, isSellingPoint = false}), false)
+
+-- P5: uden stationens grundpris: pricePerLiter × faktor nu × sværhedsgrad
+local bare = {getEffectiveFillTypePrice = function() return 470 end}
+local quote2 = ADPrices.getQuote(bare, SUGAR)
+check("P5 top fra pricePerLiter", quote2.top, 500)
+check("P5 procent", quote2.percent, 94)
+check("P5 fejlende station -> nil", ADPrices.getQuote({getEffectiveFillTypePrice = function() error("x") end}, SUGAR), nil)
+
+-- P6: bedste tilbud = højeste procent, dernæst pris
+local best = ADPrices.bestQuote({{percent = 80, price = 1}, {percent = 92, price = 2}, {percent = 92, price = 3}})
+check("P6 højeste procent", best.percent, 92)
+check("P6 ved lighed højeste pris", best.price, 3)
+check("P6 tom -> nil", ADPrices.bestQuote({}), nil)
+
+print(failures == 0 and "\nALLE TESTS OK" or ("\n" .. failures .. " FEJL"))
+os.exit(failures == 0 and 0 or 1)