<p>UCLA is a school with a specific mathematical economics major.</p>
<p>However, at many schools, you can major in economics with additional math electives, or major in math with additional economics electives, to get the intended content (presumably, you are looking at PhD study in economics).</p>
<p>A number of schools’ regular economics majors or courses are math-heavy, or have math-heavy options, without explicitly being called mathematical economics. Examples include MIT, Chicago, and Stanford, where the intermediate economics courses are more math-heavy than at most schools. Harvard and Berkeley offer math-heavy options in their intermediate economics and econometrics courses, plus additional mathematical economics electives.</p>
<p>You can check how well integrated math is in the economics courses by looking at the course catalogs to see what the math prerequisites for intermediate economics and econometrics courses are, and whether elective mathematical economics courses are offered.</p>