Final answer:
The statement that demand variability is much higher for manufacturing than it is for services is false. Services constitute the largest component of total supply, representing over 60% of GDP, while manufacturing has declined in recent years.
Step-by-step explanation:
The statement that demand variability is much higher for manufacturing than it is for services is false. The information provided shows that services constitute the largest component of total supply, representing over 60% of GDP. Manufacturing, on the other hand, has declined from 45% to about 30% of GDP. This indicates that services have a higher demand and are less variable compared to manufacturing.