Should it be legal for companies to collect and sell your personal information without your knowledge?

Should it be legal for companies to collect and sell your personal information without your knowledge?

Big Data can come from many sources within and outside of the organization and created and compiled from different groups. Should it be legal for companies to collect and sell your personal information without your knowledge? Is allowing personal information to be available to others without a user’s specific permission unethical? please answer at least 200 words

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