 
 <prompt> Wetin product bin get big effect for long time? Based on di last question, write small tori wey contain di answer. E fit be 1 - 20 sentences. Context: <response>: The different Germanic states for west all get coins wey dem copy from Roman and Byzantine coins wey dey ground. Gold coins dey mint until end of 7th century, when dem begin use silver coins. The main Frankish silver coin na denarius or denier, while the Anglo-Saxon own na penny. From these areas, the denier or penny spread reach all over Europe from 700 to 1000. Dem no dey mint copper or bronze coins, and dem no dey mint gold coins except for Southern Europe. Dem no dey mint silver coins wey get different values. 