Once they begin trading, Sypen will export both goods & will experience a trade surplus & a net inflow of money, while Harvania will have a trade deficit & a net outflow of money.
In the Neoclassical view, full employment is assumed & exchange rates bear the entire burden of adjustment. In this case, the $ would depreciate because no one is buying Harvania stuff. This will make their goods cheaper. Eventually, Harvania will be the low-cost provider of Rice & Sypen will continue to be low cost in BB's & trade will be balanced.
In the Marxist view, not only is full employment not guaranteed, but the outflow of money from Harvania means that their interest rates rise. This creates an obstacle to the needed depreciation of the $ since it makes it attractive to financial investors. Thus, the $ falls insufficiently to restore balanced trade &, instead, there is a rise in unemployment, a fall in output, & a chronic trade deficit that leads to rising external debt.