<p>The best route to an economics PHD is a math major. A close second is computer science. Since you like practical, you should try for an applied mathematics major in something like statistics or just general applied math. Graduate level economics is actually considered a subfield of applied math. Also, if you change your mind about being a PHd in economics, a math degree prepares you well for an insanely large number of professional career paths.</p>
<p>Majoring in something like biology or chemistry as preparation for an economics graduate degree makes very little sense, so I don’t know who gave you this idea, but whoever they are make sure to quit listening to them.</p>