<Tr> <Td> 533 </Td> <Td> 5,000,000 solidi </Td> </Tr> <Tr> <Td> 540 </Td> <Td> 11,300,000 solidi </Td> </Tr> <Tr> <Td> 555 </Td> <Td> 6,000,000 solidi </Td> </Tr> <Tr> <Td> 565 </Td> <Td> 8,500,000 solidi </Td> </Tr>

Explain the importance of trade during the byzantine empire