As others also noted, Figure 18a combines finance, consulting, and tech.
A lot of these schools do senior surveys and publish the results, so here is Harvardās for the class of 2023:
58.8% are going into jobs, 14.5% grad school, 6.3% professional school, 6.3% fellowships, and 14.3% donāt know or are travelling.
Of the 58.8% going into jobs, 22.1% are going into finance, 19.6% into consulting, so that is about 24.5% of the total so far. Of course this is just at graduationāsome of those people will leave those industries, but others will enter, including out of those who were going on to post-graduate education and fellowships, or didnāt know/travel.
Tech is 12.1% of jobs immediately, so another 7.1% of the total immediately, but again eventually some will leave, and others will join from other first-steps.
Figure 18a suggests eventually something a little over 40% of Ivy/Ivy Plus grads end up in finance, consulting, or tech. Weāre only at 31.6% of the Harvard class at graduation, but I can see once the other 41.2% of the class actually get their final job, that number getting up to 40%+.
Indeed, just very crudely, weāre at 53.8% of the people who have jobs so far. The remainder will probably mostly do other things, but if say half that percent, 26.9%, eventually found their way over, .269 * . 412 is .111, so weād be looking around .427 total in the end.
Thatās a very crude (and frankly contrived) model, but I think it shows how Harvardās senior survey is broadly consistent with Figure 18a.
But it does rely on including tech to get that high.