Where Shopping Trolleys Come

So many people of many nationalities from Senegalese to Romanian push shopping trolleys around Barcelona all day long on the look out for scrap metal to cash in at places like this. You have to admire their determination and, especially in the heat of summer now officially upon us, some of their strategising to shape their circuits for maximum reward. I also hear the hard nosed haggling over what their load is worth...of course, there are options re delivery points and the most hard nose recipient/buyer will lose out if they fall below market level (which will never be very fair in terms effort and reward).