For this reason Specialised Expos are cheaper to run than World Expos .
The largest pavilion may be no larger than 1,000 square meters , and the Expo site must not exceed an area of twenty - five hectares .
For this reason Specialised Expo are cheaper to run than Expo   .
The largest pavilion may be no larger than 1,000 square meters , and the Expo site must not exceed an area of twenty - five hectares .