On top of current anxieties are longer-term worries about unhelpful European regulation and the challenge to London's status from emerging financial centres in Asia.
The federal agency says the term "energy drink" isn't defined by any FDA regulation, describing it as an ill-defined marketing term with widely varying ingredients.
On the other hand, business spokespeople fear that if they argue that low taxes and streamlined regulation foster long-term economic growth, which benefits everybody, the message will resonate only with people who already see the world that way.