How did the Persians and later the Greeks help develop trade between Europe and Asia?

Silk Road routes also led to ports on the Persian Gulf, where goods were then transported up the Tigris and Euphrates rivers. Routes from these cities also connected to ports along the Mediterranean Sea, from which goods were shipped to cities throughout the Roman Empire and into Europe.

well considering i can't see the graph, it's probably prices

1. seasonal

2. frictional unenployment

3. the number of the labor force multiplied by 100 and then subtract the number of unemployed.

4. 4%

5. an increase in prices