what are the top two industries in the world and how do they effect policy?

Answer 1

too much info is needed.

Answer 2

Tourism is about 11% of the world economy and it affects policy by encouraging governments to avoid wars and terrorism and open borders and make peace. But some gov'ts still don't.

IT (information technology) is probably the largest industry in the world; certainly software and hardware have the largest number of quoted companies on major stock markets.

Both these industries affect policy positively by their internationalness. This encourages governments to allow free trade and activate deregulation. And to have schools teach English all over the world, which brings the world's people together by enabling communication as well as commerce.

They also affect regional policies. A generation ago many countries had major problems of unemployment in regions far from their major commercial centres. But IT businesses can be set up anywhere that telecoms and other 'soft' infrastructure is in place. It doesn't need to be just a few miles from the end-user market. Even Rwanda is doing it! And tourist attractions are of course often in rural and undeveloped locations such as Utah and Arizona, the Scottish Highlands and Islands, the Greek islands and so on. Kashmir, Afghanistan and Tibet will be huge tourist destinations later this century after current political tensions have been resolved.

Answer 3

when you say top 2 we can look at Financial viability, Necessity, Capital requirement, and effort (you can add more)

Arms / weaponry and Oil is effecting a lot of policies these days.
Coke is the number one brand in the world. Hollywood is a big money spinner. Construction and infra development is big too.