s="keyword">abstract</span> <span class="keyword">fun </span><span class="identifier">producesQuantity</span><span class="symbol">(</span><span class="identifier" id="kotcity.data.buildings.HasContracts$producesQuantity(kotcity.data.Tradeable)/tradeable">tradeable</span><span class="symbol">:</span>&nbsp;<a href="../-tradeable/index.html"><span class="identifier">Tradeable</span></a><span class="symbol">)</span><span class="symbol">: </span><a href="https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/i