crushed stone
...that the cost of transporting crushed stone often exceeds its cost at the quarry?
...that the cost of transporting <b id="mwCho"><a href="./Crushed_stone" id="mwChs" rel="mw:WikiLink" title="Crushed stone">crushed stone</a></b> often exceeds its cost at the <a href="./Quarry" id="mwChw" rel="mw:WikiLink" title="Quarry">quarry</a>?