No, it is not a business activity because it is not done on regular basis.
No
No its not a business activity
From the definition of the term business activity. It is refers to as any activity done in order to exchange goods or service from an individual to the next with an aim of making profit.From the question the wife exchanges clothes for utensils but we are not told that she makes any profit this may not be considered as a business activity because it has got no aim of making profit.