Australia’s fastest growing Mexican fast food chain has appointed a retail executive to share the top job with founder Steven Marks.

Ariadne executive director Gary Weiss and Qantas Loyalty chief executive Olivia Wirth have been nominated to join the Myer board as the retailer aims to keep its profit momentum going in the face of a cost of living squeeze.

The fall in the Australian dollar is expected to add to the challenges in retail, by raising costs when households are already tightening their budgets.

The Australian Consumer and Competition Commission is finalising its ruling on Brookfield and EIG’s $18.7bn offer for Origin Energy, a decision that is likely to kickstart a make-or-break period for the future for the country’s largest electricity and gas retailer.