Q&A: Can an employer significantly reduce an employee’s pay?

QUESTION
Employers are finding that under recent economic changes, the salary paid to employees may need to reflect this change by significantly reducing an employees pay to account for their budget. Employee’s on the other hand, are dissatisfied. Initially, an employer may consider changing the pay rate based on cost of living. But what happens when the cost of living significantly rises, and then drastically reduces? Readers of the Globe and Mail are asking, can an employer significantly reduce an employee’s pay? 
ANSWER
Circumstances Where an Employee’s Pay Decrease Will Be Considered Lawful

Daniel Lublin, Toronto Employment lawyer says that employers cannot drastically reduce an employee’s pay. All the same, an employee cannot pursue their employer for a minimal pay reduction. There are few circumstances where a pay decrease will be considered lawful and these need to be understood thoroughly.
Find out the answer by reading Daniel Lublin’s Globe and Mail column and full article I have to work through my severance. Is this legal?