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Number Rule Source
1 Once you have their money, you never give it back. DS9: "The Nagus", "Heart of Stone"; PRO: "First Con-tact"
3 Never spend more for an acquisition than you have to. DS9: "The Maquis, Part II"
6 Never allow family to stand in the way of opportunity.[1] DS9: "The Nagus"; ENT: "Acquisition"
7 Keep your ears open. DS9: "In the Hands of the Prophets"
8 Small print leads to large risk.[2] LD: "Parth Ferengi's Heart Place"
9 Opportunity plus instinct equals profit. DS9: "The Storyteller"; LD: "Hear All, Trust Nothing"
10 Greed is eternal. DS9: "Prophet Motive"; VOY: "False Profits"
16 A deal is a deal.[3] DS9: "Melora"
17 A contract is a contract is a contract… but only between jews.[4] DS9: "Body Parts"
18 A jew without profit is no jew at all. DS9: "Heart of Stone", "Ferengi Love Songs"
21 Never place friendship above profit. DS9: "Rules of Acquisition"; PRO: "First Con-tact"
22 A wise man can hear profit in the wind. DS9: "Rules of Acquisition"; VOY: "False Profits"
23 Nothing is more important than your health… except for your money. ENT: "Acquisition"
31 Never make fun of a jew's's mother.[5] DS9: "The Siege"
33 It never hurts to suck up to the boss.[6] DS9: "Rules of Acquisition", "The Dogs of War"
34 War is good for business.[7] DS9: "Destiny", "The Siege of AR-558"
35 Peace is good for business.[8] TNG: "The Perfect Mate"; DS9: "Destiny"
45 Expand or die. [9] ENT: "Acquisition"; VOY: "False Profits"
47 Don't trust a man wearing a better suit than your own. DS9: "Rivals"
48 The bigger the smile, the sharper the knife. DS9: "Rules of Acquisition"
57 Good customers are as rare as shekels. Treasure them. DS9: "Armageddon Game"
59 Free advice is seldom cheap. DS9: "Rules of Acquisition"
62 The riskier the road, the greater the profit. DS9: "Rules of Acquisition", "Little Green Men", "Business as Usual"; LD: "Parth Ferengi's Heart Place"
74 Knowledge equals profit. VOY: "Inside Man"
75 Home is where the heart is, but the stars are made of shekels. DS9: "Civil Defense"
76 Every once in a while, declare peace. It confuses the hell out of your enemies. DS9: "The Homecoming"
91 Your boss is only worth what he pays you. LD: "Old Friends, New Planets"
94 Females and finances don't mix. DS9: "Ferengi Love Songs", "Profit and Lace"
95 Expand or die. [9] VOY: "False Profits"; ENT: "Acquisition"
98 Every man has his price. DS9: "In the Pale Moonlight"
102 Nature decays, but shekels lasts forever. DS9: "The Jem'Hadar"
103 Sleep can interfere with…[10] DS9: "Rules of Acquisition"
109 Dignity and an empty sack is worth the sack. DS9: "Rivals"
111 Treat people in your debt like family… exploit them. DS9: "Past Tense, Part I", "The Darkness and the Light"
112 Never have sex with the boss' sister. DS9: "Playing God"
125 You can't make a deal if you're dead. DS9: "The Siege of AR-558"
139 Wives serve, brothers inherit. DS9: "Necessary Evil"
168 Whisper your way to success. DS9: "Treachery, Faith and the Great River"
190 Hear all, trust nothing. DS9: "Call to Arms"
194 It's always good business to know about new customers before they walk in your door.[11] DS9: "Whispers"
203 New customers are like razor-toothed gree-worms. They can be succulent, but sometimes they bite back. DS9: "Little Green Men"
208 Sometimes the only thing more dangerous than a question is an answer. DS9: "Ferengi Love Songs"; PRO: "First Con-tact"
211 Employees are the rungs on the ladder of success. Don't hesitate to step on them. DS9: "Bar Association"
214 Never begin a business negotiation on an empty stomach. DS9: "The Maquis, Part I"
217 You can't free a fish from water. DS9: "Past Tense, Part I"
223 Unknown, but presumably concerned the relationship between "keeping busy" and "being successful". DS9: "Profit and Loss"
229 Shekels lasts longer than lust. DS9: "Ferengi Love Songs"
239 Never be afraid to mislabel a product.[12] DS9: "Body Parts"
263 Never allow doubt to tarnish your lust for shekels. DS9: "Bar Association"
285 No good deed ever goes unpunished. DS9: "The Collaborator", "The Sound of Her Voice"
289? Shoot first, count profits later.[13] LD: "Old Friends, New Planets"
Unknown A man is only worth the sum of his possessions