marek duda, a data analyst at a big bank, is one of them. but he is also an altruist.wants to help others with his salary. that's why he donates 10% of his gross income every month to charity. he won't say exactly how much that amounts to. >> i am quite convinced by the research into the relationship between money and happiness that i have been reading which suggest that for every doubling of a presence income you gain about 1 point in a sort of 1 to 10 scale of happiness that a human being can have. and if i am able to take some of the money that i would have been not that much more happy with and i give it to some people who really need it then i am able to create quite a bit more happiness in the world and that seems like a good thing. marek does not donate his money to just any charity. he's a member of giving what we can, an international trust that gives money to those charities it believes are most effective the ones that do the most with the least money. the 1,600 members have all pledged to donate at least 10% of their income. the community has already raised

marek duda, a data analyst at a big bank, is one of them. but he is also an altruist.wants to help others with his salary. that's why he donates 10% of his gross income every month to chcharity. he won't say exactly how much that amounts to. >> i am quite convinced by the research into the relationship between money and happiness that i have been reading which suggest that for every d doublig of a presence income you gain about 1 point in a sort of 1 to 10 scale of happiness that a huhuman being can have. and if i am able to take some of the money that i would have been not t that much more happy with and i give it to some people who really need it then i am able to create quite a bit moree happiness in the world and that seems like a good thing. marek does not donate his money to just any charity. he's a member of giving what we can, an international trust that gives money to those charities it believes are most effective the e ones that do the most with the least money. the 1,600 members have all pledged to donate at least 10% of their income. the community has alrea