A major difference between Japanese Samurai and European Knights during the Middle Ages is that only Knights "<span>C. Received land in payment for their services," since in Japanese culture such land grants were not seen as being honorable. </span>
Cultural decay is when a culture no longer holds any value to the youth of the next generation and things are put aside for more interesting trends
Cultural decline is when a culture doesn't develop and leaves the next generation without anything to expand upon or grow from
Generally speaking, a "command" economy is operated solely by a central authority, such as the officials or leaders of a society, since the central agency decides how much of every product will be produced.
I believe it was Justinian that managed to unite Rome, and expanding the Byzantine Empire.