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The Gem Sea Journal

Sound numbers for working farms.
Vol. I, No. 2· Fall 27, Year 1· Crop Markets · Livestock · The Perfection Economy· Verified against SDV 1.6
This Week’s Investigations
Livestock · Analysis

Plain mayonnaise is the Valley’s most dependable paycheck

The coop offers five tenants and three ways to sell what they leave behind. The Journal has priced every slot and found that the cheapest bird in Marnie’s catalogue, fed through the cheapest machine on the farm, beats all of them: a well-kept hen’s egg becomes 285g of mayonnaise every day, repays her 800g price in under three days, and barely notices a bad week.

The Bottom Line
  • The hen wins every slot she can occupy. A hen laying Large Eggs yields gold-quality mayonnaise worth 285g a day (342g with Rancher, 399g with Artisan). No purchasable coop animal earns more per slot, and none repays its price faster: 2.8 days after she matures.
  • The machine beats the counter on every profession path. A maxed hen’s raw Large Egg is worth 164.7g on average; even a guaranteed iridium egg at 190g loses to 285g of mayonnaise. A hen sold by the raw egg on purchased hay earns exactly 0g.
  • Consistency is the real product. Mayonnaise ignores star quality, so the only variable is egg size. On a bad-mood day a fully befriended hen still averages 269.17g, about 94% of her best.
  • The coop is one step on the road to Perfection, and its last reward. Eggs and mayonnaise feed ten cooking recipes, the coop’s income funds the 10,000,000g Gold Clock, and 100% Perfection unlocks the Golden Chicken, whose egg makes 855g of mayonnaise a day.

Every farm that builds a coop faces the same short catalogue: the 800g chicken, the 1,200g duck, the 8,000g rabbit, and, for those who know where to look, the void chicken hatched from Krobus’s 5,000g egg. The community’s instinct is to diversify, on the theory that a pricier animal must produce a pricier good. The desk tested that theory slot by slot, and it does not survive the arithmetic. The cheapest bird in the catalogue, paired with a machine built from wood, stone, one Earth Crystal and one Copper Bar, out-earns every alternative a farmer can buy. This report shows why, and why the margin holds in the weeks when the farm is not at its best.

§1The hen’s arithmetic

A mature, fed chicken lays one egg every day, from the third night after purchase. An ordinary egg sells for 50g at the bin; through a Mayonnaise Machine, three hours later, it is 190g. The step that matters is the Large Egg. Once a hen passes 200 friendship, each morning she rolls for a large egg with odds of friendship plus one and a half times her mood, divided by 1,200, provided her mood is above 200. A hen at 900 friendship and a mood just over 200 clears the bar every day. A Large Egg makes gold-quality mayonnaise worth 285g, and that is the figure on which this report rests: 285g a day from an 800g bird, repaid in 2.8 days of production after she matures.

The professions scale the same product. Rancher, on the Farming 5 branch, lifts animal products and the artisan goods made from them by a fifth, so gold mayonnaise sells for 342g. Artisan, at the end of the other branch, lifts artisan goods by two fifths, to 399g. The two sit on different branches and do not normally stack, so the desk prices them separately throughout.

§2Why the machine beats the counter

A raw egg is priced by its star quality, and star quality is a fresh random roll every morning. For the best-kept hen in the Valley, at full friendship and full mood, the roll lands iridium 56.7% of the time, gold 24.6%, and silver 18.8%. Her expected Large Egg is worth 164.7g. A farmer who somehow drew iridium every day would collect 190g, still 95g short of the mayonnaise the same egg would have made. The machine does more than add value: it discards the roll entirely, since mayonnaise takes its quality from the egg’s size and never from its stars.

The Rancher branch is the one place a raw-egg strategy might hope to compete, because Coopmaster adds a third of a point to the quality score. It narrows the gap without closing it. With both professions the hen’s odds rise to iridium 73.3%, gold 19.6%, and silver 7.1%, and her expected egg reaches 210.5g; the same egg as Rancher mayonnaise is 342g, and the best raw egg the branch can ever produce is 228g. The bottom of the market is starker. A hen fed on purchased hay, at 50g a day from Marnie’s, and sold by the ordinary raw egg earns 0g: the egg pays for the hay that laid it. The same hen through the machine nets 140g on regular mayonnaise and 235g on gold.

Fig. 16
One egg, two markets

Gold per Large Egg from a fully befriended, fully happy hen · expected values over the daily quality roll · SDV 1.6

Raw, expectedRaw, best possible (iridium)Gold mayonnaise
No profession
Raw Large Egg, expected164.7g
Raw Large Egg, iridium190g
Gold mayonnaise285g
Rancher + Coopmaster
Raw Large Egg, expected210.5g
Raw Large Egg, iridium228g
Gold mayonnaise342g
The raw figures are expected values: on any given morning the hen’s egg may sell for less. The mayonnaise figures carry no such variance. Hover or focus any bar for the mechanism.

§3The consistency premium

A farm does not run at its best every day. It rains, the coop door stays shut in winter, the farmer misses a morning of petting, and a hen’s mood sags below 200. The large-egg formula handles that case gently: below a mood of 200 the mood term drops out, and a hen at full friendship still lays large on five mornings in six. Her expected output on a bad day is 269.17g of mayonnaise, about 94% of her best, and a new hen that has not yet earned a single Large Egg still makes 190g. The raw market offers no such floor, because a mood below 150 removes the quality roll altogether.

The rhythm of production matters as much as its level. The hen lays daily, so the machine is fed daily and the shipping bin fills at the same pace every day of the year. The duck lays every second day and the rabbit every fourth, which means larger, lumpier payments and more idle machine hours. At three hours a cycle, a Mayonnaise Machine loaded in the morning and again after the day’s work processes two eggs, so twelve hens need six machines. The machine is available from Farming level 2 and is the cheapest piece of capital in the operation.

§4The competition, slot by slot

Each alternative tenant has a case, and the desk priced each one against the hen it would displace. The void chicken comes closest: it lays every day and its egg makes 275g void mayonnaise. It is still 10g a day short of the white hen, and it costs 5,000g and an incubation where she costs 800g. The duck is the curious one. A duck lays every second day, and its egg makes duck mayonnaise at 375g, or 187.5g a day, already below a new hen’s regular mayonnaise. As the duck grows happier it begins to drop a 250g feather in place of the egg, so its output falls toward 125g a day. On the duck, the better the husbandry, the lower the return.

The rabbit is a collection animal priced like an investment. At 8,000g it produces wool every fourth day: 85g a day raw, 117.5g as cloth, and at most 141.2g a day once its feet arrive. Even on the all-feet case it needs 56.6 days of output to repay its price, against the hen’s 2.8. In a full Deluxe Coop, where every slot could hold a 285g hen, the opportunity cost is the clearest way to read the table: a duck gives up 97.5g to 160.0g a day, a rabbit 143.8g to 167.5g, and a void chicken 10g. The desk’s recommendation is to buy one of each of these for the bundles and the collection, and to give every other slot to a hen.

Fig. 17
What a coop slot earns

Gold per animal per day at steady state · best case for each tenant, base prices · SDV 1.6

Hen, gold mayonnaise285g
Void chicken, void mayonnaise275g
Hen, regular mayonnaise190g
Duck, duck mayonnaise187.5g
Rabbit, rabbit’s foot141.2g
Hen, raw egg50g
The duck and rabbit rows are ceilings: the wiki publishes no threshold for feathers or feet, so the desk shows each at its best. The full range, with Rancher and Artisan columns, is in the appendices.

§5The full Deluxe Coop

Built in sequence, the Coop, Big Coop, and Deluxe Coop cost 34,000g in gold with 1,200 wood and 450 stone, and twelve hens add 9,600g. Twelve happy hens produce 3,420g of gold mayonnaise a day, which repays the entire 43,600g outlay in 12.7 days. Across a 28-day season the coop delivers 95,760g, or 114,912g with Rancher and 134,064g with Artisan. Winter is the expensive season, since the birds stay indoors and eat from the silo; if every bite of hay were bought at Marnie’s, the bill would come to 16,800g, and the coop would still net 78,960g.

§6The coop on the road to Perfection

For the farmer pursuing the long game, the coop is more than a revenue line. Perfection is the game’s complete score, tracked by a statue in Qi’s Walnut Room on Ginger Island across eleven categories: produce and forage shipped, obelisks, the Gold Clock, the Monster Slayer goals, friendship with every villager, farmer level, stardrops, every cooking recipe, every crafting recipe, every fish, and every golden walnut. Raising animals is one of the first steps toward it. Eight of the game’s 81 cooking recipes call for an egg and two more for mayonnaise; the Mayonnaise Machine is itself one of the 149 crafting recipes; and the coop’s daily income is a dependable contributor to the 10,000,000g Gold Clock, the largest single purchase on the tracker. On the way there, eggs fill the Community Center’s Animal and Home Cook’s bundles and Gus’ Famous Omelet special order.

Perfection also returns the favor. Reaching 100% unlocks the Golden Chicken, whose daily Golden Egg makes three gold-quality mayonnaise worth 855g, or 1,197g with Artisan. The desk notes the symmetry: the coop is among the first buildings on a Perfection run, and it is where Perfection pays its dividend.

From the Journal’s Publisher The Perfection Planner, from Inland Valley Guides, schedules a full run to 100% Perfection one day at a time: 336 planned days from Year 1 Spring 1 to Year 3 Winter 28, across 224 pages, covering all eleven categories of the tracker. Its coop follows the policy in this report. The Coop is ordered on Spring 25 and four hens arrive on Spring 28; the first eggs and three Mayonnaise Machines come on Summer 4; a gold mayonnaise goes into the Luau soup on Summer 11; the Big Coop follows on Summer 14 with two ducks and two more hens, and the Deluxe Coop on Winter 1 with one rabbit for the bundle wool. In the Planner’s own words, “Every hen is 190g a day as mayonnaise, so the Big Coop pays for itself.” In paperback: color edition, $29.99 · black and white edition, $19.99.

§7The verdict

The ranking for a coop slot, complete: the hen through the machine, then the void chicken by a hair at six times the price, then the duck, then the rabbit, and last the hen sold by the raw egg, which on purchased hay earns nothing at all. The duck and the rabbit each belong in the coop once, for the bundles and the collection. Every other slot belongs to a hen, every egg belongs in a Mayonnaise Machine, and the case rests less on the size of the margin than on its reliability: a product whose price depends only on whether the egg was large is the steadiest income the Valley offers a farm of any size.

Buy one duck and one rabbit for the collection, give every other slot to a hen, and put every egg through the machine.
For the Serious Operator · Data Appendices
I1 · The price ladder
Sell prices, SDV 1.6. Rancher ×1.2 applies to animal products and the artisan goods made from them; Artisan ×1.4 to artisan goods.
GoodBaseRancherArtisan
Egg (normal / silver / gold / iridium)50 / 62 / 75 / 10060 / 74 / 90 / 120–
Large Egg (normal / silver / gold / iridium)95 / 118 / 142 / 190114 / 141 / 170 / 228–
Mayonnaise190228266
Mayonnaise, gold (from a Large Egg)285342399
Duck Mayonnaise375450525
Void Mayonnaise275330385
Cloth470564658
Golden Egg as 3 gold mayonnaise8551,0261,197

Raw goods without an artisan step: Duck Feather 250g, Wool 340g, Rabbit’s Foot 565g, Golden Egg 500g. Hay at Marnie’s: 50g.

I2 · Per animal per day
Steady state, gold per animal per day. Payback is purchase price over base daily output, after maturity.
Animal and productBaseRancherArtisanNet on bought hayPricePayback
Hen, gold mayonnaise285.0342.0399.0235.08002.8 d + 3 nights
Hen, regular mayonnaise190.0228.0266.0140.08004.2 d + 3 nights
Hen, raw egg50.060.0–0.080016.0 d + 3 nights
Void chicken, void mayonnaise275.0330.0385.0225.05,00018.2 d + 3 nights
Duck, all eggs to mayonnaise187.5225.0262.5137.51,2006.4 d + 5 nights
Duck, all feathers125.0150.0–75.01,2009.6 d + 5 nights
Rabbit, all feet141.2169.5–91.28,00056.6 d + 6 nights
Rabbit, cloth117.5141.0164.567.58,00068.1 d + 6 nights
Rabbit, raw wool85.0102.0–35.08,00094.1 d + 6 nights
Golden Chicken, 3 gold mayonnaise855.01,026.01,197.0805.0–Perfection reward

Slot cost against a 285g hen: void chicken −10.0g a day; duck −97.5g (all eggs) to −160.0g (all feathers); rabbit −143.8g (all feet) to −167.5g (cloth).

I3 · Large eggs and the quality roll
Large-egg chance = (friendship + mood × modifier) / 1,200 at 200+ friendship; modifier 1.5 above mood 200, 0 at mood 100 to 200.
HenP(large)Expected mayonnaise
Friendship 150 (new)0%190g
Friendship 600, mood 21076.25%262.44g
Friendship 900, mood 201100%285g
Friendship 1,000, mood 100 to 200 (a bad day)83.33%269.17g

Raw quality for a hen at friendship 1,000 and mood 255: iridium 56.7%, gold 24.6%, silver 18.8%; expected Large Egg 164.7g. With Coopmaster’s +0.333 quality score: iridium 73.3%, gold 19.6%, silver 7.1%; expected Large Egg with Rancher 210.5g.

I4 · The full coop & methodology

Twelve happy hens: 3,420g a day (4,104g Rancher, 4,788g Artisan); 95,760g a season (114,912g, 134,064g). Buildings 34,000g, 1,200 wood, 450 stone; with hens 43,600g, repaid in 12.7 days. Winter hay, all purchased: 16,800g; winter net 78,960g. Six machines at two loads a day. Mayonnaise Machine: 15 wood, 15 stone, 1 Earth Crystal, 1 Copper Bar; Farming 2; 3 hours a cycle.

Methodology: quality prices floor(base × 1.25 / 1.5 / 2); profession prices floor(price × 1.2 or 1.4). Quality odds follow the Animals page score, friendship/1,000 − (1 − mood/225), checked iridium, gold, silver in order. Duck and rabbit outputs are bounded rather than averaged because no feather or foot threshold is published. Hay at 50g a day is the worst case; grazing is free. Sources: Stardew Valley Wiki pages for Chicken, Duck, Rabbit, Void Chicken, Golden Chicken, Mayonnaise Machine, Egg, Cloth, Hay, Coop, Animals, and Perfection (1.6 revisions).

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