Norway’s Oil Fund is the world’s largest sovereign wealth fund, currently valued at $1 trillion. The fund has a lot of challenges, as it has to adhere to the country’s standards for ethics and sustainability. This is maintained by the ethics board, which has the ability to “blacklist” companies such as those involved in nuclear weapons, tobacco, or with corruption allegations. Walmart was excluded in 2006 for being in breach of labour rights. As the fund owns an average of 1.4% of every listed company worldwide, concerns have been raised over whether it is to susceptible to stock market changes.