Calculate lose: lady, shopKeeper & 1000 dollar fake note puzzle

Lady, shopKeeper & 1000$ fake note puzzle

Shopkeeper A is selling the goods at no profit no loss (zero profit).
Lady buys an item worth 200 $ from shopkeeper A.
Lady gives 1000$ to shopkeeper A.
Shopkeeper A takes the change of 1000$ from another shopkeeper B (next door)
Shopkeeper A keeps 200$ and returns 800$ to lady.
After some time, Shopkeeper B comes back to shopkeeper A.
- Shopkeeper B returns 1000$ note saying its fake.
- Shopkeeper B takes 1000$ from shopkeeper A.
How much loss the shopkeeper A will have?

In profit loss paradigm, the profit of one party is the loss of another party.
There are couple parties doing financial deals.
- Shopkeeper A and shopkeeper B
- Shopkeeper A and Lady
Financial interaction between shopkeeper A and shopkeeper B
1. Shopkeeper A has 1000$ fake note.
2. Shopkeeper A went to shopkeeper B and got 1000$ change for its fake 1000$ note.
3. Latter on, Shopkeeper B comes back with 1000$ fake note and take his 1000$ back from shopkeeper A.
4. After point 1,2 and 3, the net transaction is zero (shopkeepers attain their original state).
  - Shopkeeper A will have its 1000$ fake note and shopkeeper B will have its 1000$.
5. No profit no loss interaction.
Financial interaction between shopkeeper A and Lady.
- Lady has Item of worth 200$ and got 800$ cash from shopkeeper A.
- Lady will have the profit of 1000$.
- The profit of lady is the LOSS of shopkeeper A.
- Shopkeeper A will have loss of 1000$.
- OR
- Shopkeeper A has 1000$ fake note.
  - Shopkeeper A gives an item worth 200$ and cash of 800$.
  - The loss to shopkeeper A is 200$ + 800$ = 1000$
  - Simply put the Fake currency note 1000$ is the LOSS.
    - Fake currency loss has to bear by somebody, In our case its shopkeeper A.

The loss to Shopkeeper A will be 1000$.