The &quot;displayed size&quot; would probably shrink, but so what? You&#x27;d just need to look at the book to see it.<p>Decimalization would help even with equities where the natural size &gt; 1c. HFTs who want to get to the top of the book could compete by offering $10.0073 instead of racing to be the fastest at $10.0100. HFTs would compete on price rather than speed.