Answer:
The Technology.
Step-by-step explanation:
Kuwait has a huge natural reserves of oil. That raw resources alone able to sustain the country's economy and made it one of the richest country in the world. (90% of the country's economy relied on oil).
Germany does not have such luxury. But still, It is also considered one of the richest country in the world. The reason is they are so prominent in science researches /development and develop their economy around it. Machinery, Automotive, Aviation, Chemical , And Medical Industry are the biggest industries in Germany.