weirdness / jquery / ajax

In controller:

function new_list() {

Configure::write('debug', 0);
$this->autoRender = false;

$this->loadModel('Menugroup');
$this->Menugroup->recursive = 1;

if($this->RequestHandler->isAjax()) {

$menugroups = $this->Menugroup->find('list', array('order' =>
array('Menugroup.order DESC')));
$result = json_encode($menugroups);
// echo $result;
$this->set('result', $result);
}

}

In Jquery:

$('.new_list-link').click( function () {
$.post('/menus/new_list', function(result) {
$('#menu_list').html(result);
});
});

I get an empty list unless I uncomment that echo statement in the
controller, then it works great.
Why would this make a difference or even be necessary?

Thanks!!

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