why do I keep getting old and busted pip and setuptools versions?

pip-virtual-versions-in-a-new-shell.sh

$ which pip
# /usr/local/bin/pip
$ which virtualenv
#/usr/local/bin/virtualenv

$ pip --version
# pip 9.0.1 from /usr/local/lib/python2.7/site-packages (python 2.7)

$ virtualenv --version
# 1.11.6

$ virtualenv venv
# New python executable in venv/bin/python2.7
# Also creating executable in venv/bin/python
# Installing setuptools, pip...done.

$ source venv/bin/activate
$ pip --version
# pip 1.5.6 from /Users/chrisadams/Desktop/project/venv/lib/python2.7/site-packages (python 2.7)