If I may add, Oxfam does quite a bit of work on tax evasion, and I'll let my colleague Kelly speak to that.
Another way to be effective is to focus on women and girls. There is a lot of is evidence that if you invest in women and girls there will be a multiplier effect. Women and girls are a lot more likely to reinvest in their families, and their communities, and their households. The impact will be greater by putting women and girls at the heart of all that we do.
I would second Fraser's comment that we need to work with local governments. A lot of the countries where Oxfam works are middle-income countries. There are a lot of resources available at the local level, but what we try to do in those countries is work with civil society and build the capacity of our local civil society partners, so they can hold their governments to account and ensure their governments are investing in social programs that meet the needs of the poorest and the most vulnerable. That's another way to multiply your impact with the limited resources we have.