Answer:
The Silk Road is the concept of a chain of roads and other means of passage from Xi'an in China to the Mediterranean Sea. Basically a way opened up for trade via land routes. It was 7000 miles long.
For the goods which were traded using the Silk road, as they traveled along their prices increased at each city, i.e. situated along the route to its destination. This was so because as new transporters would pick up the goods and next it would be moved further from their original destination. Therefore an increase in overall price.
