I'm getting my FX rate information from a provider that only provides me one direction THB => CHF.
Now I want to calculate the inverse: CHF => THB.
I see two possibilities:
- Take the middle of the rate THB => CHF and compute the inverse
- Go over the USD: CHF => USD => THB
What is the correct way? Consider two scenarios:
- I only want the middle of the rate
- I want the bid and ask