How did Alexander the great change the coinage system?

At the time of Alexander's death his coinage was used throughout the entire empire. Antipater, ruling in Macedonia in Alexander's absences, could not make a widespread change in this system, but by minting coins of Philip in Macedonia he created a type of local coinage.

Where can I buy Alexander the great gold & silver coins?

Let us help! Alexander the Great gold and silver coinage is available for sale at Austin Rare Coins. Call 1-800-928-6468

How long did Alexander the great live on a coin?

Even as the successor kings initialed coinages in their own names and with their own types the "Alexanders" lived on for two centuries during which time they were issued by independent cities as an international coinage. Today "Alexanders" still exist by the thousands.