Is there a default resource pool?

All - I read the white paper on esxtop that was written by Scott Drummond and can be found here - & gt; http://communities.VMware.com/docs/doc-9279 In this one, page 9, under the definition of 'State', he said:

While the state memory of the host is not used to determine if the memory should be retrieved from virtual machines (which
decision is made at the level of the resource pool), it may affect what mechanisms are used to retrieve the memory if necessary.
In the States high and soft, ballooning is favored over permutation. In States hard and low, swapping is favored by report
balloon flight

So my question is, what happens if I do not defined resource pools?  Is there a default pool?  If not, are there any rehabilitation of the memory available for my guests/guests?

"Every independent host and each DRS cluster has a pool of resources of root (invisible) which brings together the resources of the host or a cluster. The resource pool root does not appear because the resources of the host (or cluster) and the root resource pool are always the same. "- extract from http://pubs.vmware.com/vi35u2/resmgmt/wwhelp/wwhimpl/common/html/wwhelp.htm?context=resmgmt&file=vc_resource_pools.5.2.html

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    =========================================================================

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