Rothschild, who chairs the RIT Capital Partners investment trust, refers to his family businesses which originated with five brothers setting up the “first truly international banking system,” operating from London, Paris, Vienna, Naples and Frankfurt at the end of the 18th century.
He said: “The brothers, working together to exchange information and ideas, built an extraordinary business that operated across boundaries and cultures.
“150 years later, the foundation of the EEC operated on similar principles, namely that we are stronger and better off together.”
Rothschild also alludes to a number of major independent institutions, including the IMF, OECD and the Bank of England, all of which have warned against leaving the EU as it would cause the UK economy to suffer.
The OECD have said UK GDP could fall more than 3% in the case of a Brexit and believes the UK’s “economic dynamism and productivity” would suffer.