Si fraus in taberna latet, mercator parvum lucrum facit, emptor autem magnum damnum patitur.

Si means if. It introduces the condition of the sentence:

Si fraus in taberna latet = If fraud/deceit is hidden in the shop

So the whole sentence is a conditional statement: if one thing is true, then the following results happen.

Fraus is nominative singular, so it is the subject of latet.

Latin often marks the subject by its ending rather than by word order. Here:

• fraus = fraud, deceit
• latet = lies hidden / is hidden

So fraus latet means fraud is hidden or deceit lurks.

After in, Latin can use different cases depending on the meaning:

• in + ablative = in, on, at a place
• in + accusative = into, onto a place

Here taberna is ablative singular, because it means location:

in taberna = in the shop

It is not motion toward the shop, so the ablative is used.

Latet comes from lateo, latere, meaning to lie hidden, to be concealed, or to escape notice.

So fraus in taberna latet is not just fraud is in the shop, but more specifically fraud is hidden in the shop or deceit is lurking in the shop.

Mercator is nominative singular, so it is the subject of facit.

That part of the sentence is:

mercator parvum lucrum facit
= the merchant makes a small profit

So mercator is the one performing the action.

Both lucrum and damnum are neuter singular accusative direct objects:

• lucrum = profit
• damnum = loss, damage

The adjectives must agree with the nouns they describe in gender, number, and case:

• parvum lucrum = a small profit
• magnum damnum = a great loss

They end in -um because they are modifying neuter singular accusative nouns.

Because facit is a transitive verb here and takes a direct object.

• facit = makes
• What does the merchant make? parvum lucrum

So lucrum is in the accusative case as the direct object.

Emptor is nominative singular, and it is the subject of patitur.

That clause is:

emptor autem magnum damnum patitur
= but the buyer suffers a great loss

So:

• emptor = buyer
• patitur = suffers/endures

This is very normal in Latin. Autem means however, but, or on the other hand, and it often comes in the second position of its clause rather than at the very beginning.

So Latin says:

emptor autem = the buyer, however / but the buyer

This placement may feel unusual to an English speaker, but it is standard Latin usage.

Patitur comes from patior, pati, passus sum, which is a deponent verb.

A deponent verb:

• has passive-looking forms
• but an active meaning

So although patitur looks passive in form, it means he/she/it suffers or endures, not is suffered.

This is a very common thing for Latin learners to ask, because deponent verbs look strange at first.

This is a simple present condition:

• Si fraus in taberna latet = If fraud is hidden in the shop
• then the consequences follow in the present:
  • mercator parvum lucrum facit
  • emptor autem magnum damnum patitur

Latin uses the present indicative here just as English often does for a general statement:

If fraud is present, the merchant makes a small profit, but the buyer suffers a great loss.

It can sound like a general truth or regular pattern.

Classical Latin has no definite article (the) and no indefinite article (a/an) as separate words.

So:

• mercator can mean the merchant or a merchant
• emptor can mean the buyer or a buyer
• taberna can mean the shop or a shop

English has to choose one when translating, but Latin leaves that to context.

Latin word order is more flexible than English word order because case endings show the grammatical roles.

This sentence is perfectly natural as written, but many parts could be rearranged without changing the basic meaning. For example, Latin can move words for emphasis.

The current order does a nice job of presenting:

1. the condition: Si fraus in taberna latet
2. the merchant’s result: mercator parvum lucrum facit
3. the contrasting buyer’s result: emptor autem magnum damnum patitur

So the word order helps the style and emphasis, even though the endings carry the grammar.

The sentence sets up a moral or economic contrast:

• mercator parvum lucrum facit = the merchant gains a little
• emptor autem magnum damnum patitur = but the buyer suffers a great loss

The contrast word autem highlights that the outcomes are unequal. One side gets a small benefit, while the other side suffers a much bigger harm.

So the sentence is not just grammatical practice; it also suggests an idea about unfair trade or deception.