COMPANIES can sack a worker and readvertise the same job at lower pay under a landmark ruling that opens the way for employers to make “difficult” staff redundant for financial reasons. Business hailed the Australian Industrial Relations Commission decision last night, declaring it had significant ramifications for the rights of employers to fire workers. But workplace lawyers warned the decision “opens a Pandora’s box”, allowing employers to sack workers they regard as “troublemakers” and replace them with cheaper labour.