i.e easy money
example if Movie A has made $10M in box office, but the stock is only at $9, the stock is ARB. Since we know that the stock eventually cashes out at its box office total, we know for sure that we will make that $1 profit, so ARB's are awesome
also, there is BRA where a film cant possibly make its stock price (like, Movie A, a limited release in its 11th week is just about out of theaters, having made $10M in box office but is priced at $15 a share, well then it has no realistic shot to make its price, then its BRA (posting BRA's though is genreally frowned upon, because theres no true guarantee, the way there is with an ARB situation)
so if you see an ARB, buy
or BRA, short
But be careful to pay attention for commission, and also by the time you see a stock said to be ARB it may no longer be so