Your personal statement should show why the joint course makes sense. One useful approach is to choose two or three linked problems: industrialisation, inflation, inequality, institutions, empire, migration, financial crises, or long-run growth.
Do not write one paragraph about “loving history” and another about “being interested in economics”. Instead, show how a historical question becomes sharper when you bring in incentives, trade-offs, markets, institutions, data, or distributional effects.
Because no previous formal Economics qualification is required, the personal statement is a useful place to show independent economic reading or problem-solving. It also helps to frame your evidence in a way that could lead into Oxford’s tutorial-style interview: a claim, the evidence you tested, the assumption you questioned, and what you would ask next.
Avoid overloading the statement with competitions and book titles. Reflection matters more than volume.