  Under short sales prohibitions, no free lunch with vanishing risk (NFLVR-S)
is known to be equivalent to the existence of an equivalent supermartingale
measure for the price processes (Pulido [22]). For two given price processes,
we translate the property (NFLVR-S) in terms of so called structure conditions
and we introduce the concept of fundamental supermartingale measure. When a
certain condition necessary to the construction of the fundamental martingale
measure is not fulfilled, we provide the corresponding arbitrage portfolios.
The motivation of our study lies in understanding the particular case of
converging prices, i.e., that are going to cross at a bounded random time.
