Commerce Formulas

Commerce Formulas

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Sources: [FAQ] = Might and Magic FAQ.txt §§3-6/3-10/4-1/3-2-2 (Andrew Schultz v2.2.0); [ASM] = mm2.capstone.asm; [DATA] = data hunk tables.

Cross-references: 28-town-services.md (ASM handlers/tables), 32-character-mechanics.md (level/stat context).

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1. Training cost formula [FAQ §3-6]

Training cost (gp) = current_level × training_town_index × 50

Training town index (not the same as the map/location index):

Training index	Town	Map index (A4-$79F2)
1	Middlegate	0
2	Sandsobar	4
2	Tundara	2
4	Vulcania	3
5	Atlantium	1

Map index → training index array: [1, 5, 2, 4, 2] (map 0..4). [ASM confirmed: 28-town-services.md §9.1]

Ported (remake). This cost + the stat-training leaf (0x1C898), the temple heal/restore/donation leaves, and the blacksmith buy leaf (0x1BE44 price 0x1BF16 over items.dat gold; mm2_smith_inventory/mm2_smith_price) are implemented byte-exact in game/src/events/TownServiceTransactions.{h,cpp} + TownServiceMenu.{h,cpp} (constants/tables: EXTRACTED/decomp/mm2_town_tables.{h,c} + tools/mm2_town_tables.py), driven by the swappable ITownServiceUi menu backend. See 28-town-services.md §1.4.1/§1.4.2/§4.1.1 and 07-event-script-opcodes.md §OP_0E.

Healing cost (FAQ §3-6):

Healing cost (gp) = current_level × training_town_index × 10

Multipliers for condition:

• ×10 if dead (instead of base ×10, effectively a ×100 of living cost — see note)
• ×100 if eradicated

The FAQ reads: "Healing current level * town index * 10 * (10 if dead, 100 if eradicated)". Interpretation: base is level × index × 10; multiply by 10 for dead, 100 for eradicated. So dead healing = level × index × 100 and eradicated = level × index × 1000. [FAQ §3-6] Status: FAQ-sourced. ASM healing formula not yet fully confirmed in current trace.

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2. Day-based shop bonus cycle [FAQ §3-6]

Item bonus + value in shops follows a ~30-day cycle (same pattern repeats with escalation):

Day mod 30	Bonus +
1	1
2	0
3	1
4	2
5	0
6	1
7	0
8	1
9	2
10	0
11	1
12	0
13	1
14	3
15	0
16	1
17	0
18	1
19	4
20	1
21	1
22	0
23	1
24	5
25	0
26	1
27	0
28	1
29	5
30	special*

Special multiples-of-30 bonus:

Day	Bonus +
30	+5
60	+6
90	+7
120	+8
150	+9
180	+12

[FAQ §3-6] These are the best shop days to buy items if you want high magic bonuses. Status: FAQ-sourced. ASM calendar date index at A4-$79B6; Today's Specials date index from A4-$681C/$6816 (see 28-town-services.md §4.1). Whether the above bonus cycle is from the specials table or the general bonus system is not yet ASM-confirmed.

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3. Portal table [FAQ §4-1]

Town-to-town portals (in-town teleport tiles). All are bidirectional except the last Atlantium → Middlegate leg.

From	Tile (x,y)	Cost (gp)	To	Tile (x,y)	Direction
Middlegate	(0,5)	10	Sandsobar	(6,1)	20
Sandsobar	(4,14)	50	Tundara	(6,11)	10
Tundara	(6,9)	50	Vulcania	(6,3)	30
Vulcania	(8,3)	100	Atlantium	(3,0)	50
Atlantium	(12,0)	25	Middlegate	(0,5)	one-way

The last leg (Atlantium → Middlegate) is one-way only. [FAQ §4-1]

Portal selectors in event.dat (OP_0E dispatch): 0x64, 0x7E–0x83, etc. (see 28-town-services.md §1.2).

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4. Fly spell landing coordinates [FAQ §3-2-2-2]

S3/2 Fly lands the party at a fixed coordinate in any of the 20 outdoor sectors. Coordinates are in the overland map's local tile system (x,y):

	A	B	C	D	E
1	(13,3)	(14,3)	(3,3)	(5,3)	(1,3)
2	(8,7)	(13,7)	(8,4)	(4,4)	(3,7)*
3	(14,14)	(15,3)	(14,3)	(13,3)	(0,0)
4	(14,10)	(13,15)	(3,14)	(13,10)	(3,10)

* E2 (3,7) = oasis area. [FAQ §3-2]

Chain two fly spells together for a bigger jump (e.g. fly to A4 pool, then fly to target sector). [FAQ §3-2]

Town locations reachable via fly (approximate sector):

Town	Sector	Notes
Middlegate	C2	1 west + 1 south from fly landing
Atlantium	A4	~½ west from fly landing
Tundara	A1	~½ west from fly landing
Vulcania	E1	1 east + 1 north
Sandsobar	E4	~2 east

[FAQ §4-1 — approximate; exact approach paths vary]

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5. Bar drinks sub-game [FAQ §3-10-3]

Available at all town pubs (handler 0x1A132, menu B). Six drinks; getting sick resets all stats.

Drink	Condition for bonus	Effect per success
Orc Beer	1st drink successful	+5 Might per success after the first
Straight Shot	2 drinks successful	+20 Accuracy per success after the second
ID Elixir	2 drinks successful	+10 Personality per success after the second
Academic Ale	2 drinks successful	+10 Intelligence per success after the second
Rare Vintage	2 drinks successful	+3 Levels per success after the second
Mystic Brew	4 drinks successful	+1 Spell Level per success after the fourth

If you get sick drinking any beverage, all stats are reset. [FAQ §3-10-3]

Same drink names appear in all five towns. [ASM: 28-town-services.md §13.3]

Status: FAQ-sourced. Drink stat effects not yet ASM-confirmed (drink handler at 0x18F78).

Port status (remake): DEFERRED (engine/RNG/VM-gated). The drink cost (0x18F78) is RNG-encoded (-$7BB4) into roster +$78; the sick/success roll is 0x19D64 (RNG(50)==2) / stat-reset 0x19B28; per-drink stat bonuses are applied by unported VM opcode handlers via counters A4-$79A6–$79AB. The pub menu itself routes through the runtime vtable thunk -$7D40 (selectors 0xC9/0xCA → 0x1980A). See 28-town-services.md §13.3.1. Not ported (no deterministic leaf to faithfully model).

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6. Bar food entrees + event trigger coordinates [FAQ §3-10-1]

After eating an entree (roster $78 flag), various event tiles become active in the overland or dungeon.

Town	Menu	Name	Cost (gp)	Event trigger / effect
Middlegate	A	Horrors d'oeuvres	10	C1 (2,10) — undead don't flee
Middlegate	B	Soup de Ghoul w/Garlic Toast	50	C1 (2,6) — get past undead
Middlegate	C	Dragon Steak Tartar	100	D1 encounter? (unconfirmed)
Atlantium	A	Lightly Salted Tongue of Toad	1,000	C4 (14,8)? — for the undead wood (unconfirmed) [FAQ hint]
Atlantium	B	Puree of Gnome	2,000	A2 (14,10) — gnome attack (a dud) [FAQ hint]
Atlantium	C	Devils Food Brownie	3,000	C1 (1,8) — grants S5/2 Fingers of Death
Tundara	A	Sizzling Swine Soup	200	(effect unconfirmed)
Tundara	B	Red Hot Wolf Nipple Chips	100	C3 (1,9) — grants C2/3 Nature's Gate
Tundara	C	Roast Leg of Wyvern	1,000	(effect unconfirmed)
Vulcania	A	Pickled Pixie Brains	5,000	(effect unconfirmed)
Vulcania	B	Deep Fried Troll Liver	500	Vulcania NPC event — unlocks Thund R + Aeriel
Vulcania	C	Cream of Kobold Soup	1,000	E1 (3,1) — "You killed our pal!" kobold encounter
Sandsobar	A	Gourmet Dinner B Wyrm Chop Suey	20	Sandsobar inn (3,11) — unlocks H K Phooey
Sandsobar	B	Roast Peasant under Glass	50	E4 (3,10) — fight peasants
Sandsobar	C	Phantom Pudding (Very Low-cal)	250	Sarakin's Mine (7,3) — cave-in event

Costs confirmed by ASM data hunk A4-$6760 (BE u16 per town × menu slot): see 28-town-services.md §13.3. Event coordinates from [FAQ §3-10-1]. Bar tip hints in the FAQ (§3-10-2) cross-reference these coords — e.g. "Meal C, then C1 1,8".

Port status (remake): DEFERRED. The pub feeding-frenzy path (0x18EC0 → 0x019030) is RNG-gated and writes an encoding byte to roster +$78/+$7C rather than deducting these gp; the A4-$6760 gp table's only confirmed static consumer is a temple-style food UI (0x1CAC4/0x1CEA4 + 0x1C9C0), so whether the pub reuses it is unconfirmed. Not ported to avoid fabrication — see 28-town-services.md §13.3.1.

Bar rumor hints also appear in pub menu E (listen for rumors); same hints as seen in EXTRACTED/embedded_strings.txt and str.dat.