Australia&#x27;s constitution (S54 and S55) requires all appropriations bills to be <i>only</i> about appropriations (&quot;supply&quot;, as we call it). Anything else in a money bill causes the entire bill to become invalid.<p>That and party discipline means that US-style horse-trading is much harder. There&#x27;s still pork-barrelling, but it&#x27;s driven by the party&#x27;s assessment of which seats need to be shored up, rather than every single electorate getting bacon grease, squeaky or not.