Possible Duplicate:
Which is correct: “what if there was” or “what if there were”?
Correct usage of was/were on the object of a sentence
“Was” or “were” in subjunctive clauses
I have the following sentence in the draft of my latest paper:
No arbitrage would be introduced if the project were traded.
Is this version correct? Or should it be:
No arbitrage would be introduced if the project was traded.
What are the rules here?