The gap between price return and total return is entirely accounted for by income, and nothing else. For an investment that pays no dividends or interest at all, price return and total return are identical, because there is no income to add back. For an income-paying investment, the two diverge, and the size of the gap tracks how much income was paid and how long it had to compound once reinvested. A stock or fund with a high dividend yield held for many years can show a price return that looks modest next to a total return that is dramatically higher, purely because of the compounding effect of reinvested dividends over time. The mechanics of that calculation, including the assumption that income is reinvested, belong to the page on total return.
This is exactly why the widely quoted level of a major stock index understates what an investor in that index actually earned. The day-to-day headline figure for an index is its price level, which reflects only price return. An investor who owned a fund tracking that same index and reinvested its dividends earned the index's total return, which over long periods has historically run meaningfully ahead of its price return. Comparing a fund's own stated total return against the index's quoted price level, rather than against the index's own total return figure, is a common and misleading mismatch.
The distinction matters most for income-heavy holdings and matters least for growth-oriented ones. A high-dividend stock, a bond fund, or a REIT, each of which typically distributes a substantial share of its return as income rather than price appreciation, will show a much larger gap between price return and total return than a stock that pays no dividend and returns everything through price change alone. Comparing two different kinds of holdings using price return alone can therefore make the income-paying one look weaker than it actually performed, simply because its income component has been left out of the comparison.
Neither figure adjusts for inflation or taxes, and that limitation applies equally to both. Price return and total return are both nominal measures of what the investment itself did; what that return is worth in purchasing power, or what remains of it after tax in a taxable account, are separate calculations covered elsewhere. The choice between price return and total return is about whether income is included at all, not about inflation or tax treatment.