Vox Royalty (TSE:VOXR) shareholders should be worried about its cash burn. For the purposes of this article, cash burn is the annual rate at which an unprofitable company spends cash to fund its growth; its negative free cash flow. Generally speaking, a listed business can raise new cash through issuing shares or taking on debt. In that case, it may never reach the end of its cash runway before then. It may already be apparent to you that we're