BARRIE -- The United States opened its land border to Canadians fully vaccinated against COVID-19 on Monday, but a mandatory negative PCR test upon arrival back in Canada may be dissuading some consumers from making the trip to America to shop.

That鈥檚 according to David Soberman, a professor of marketing at the University of Toronto鈥檚 Rotman School of Management.

He said cross-border shopping trips likely won鈥檛 be as popular as in previous years, namely because of the testing requirements to re-enter Canada.

鈥淭he PCR tests are quite expensive and you need to get one in order to cross back into Canada,鈥 he said.

Currently, anyone entering Canada must show proof of a negative PCR test for COVID-19 taken no more than 72 hours before their arrival at the border.

Those tests are to be taken at the traveller鈥檚 expense, and while the costs of PCR tests vary, they often carry a price tag of more than $100.

鈥淧eople often go on these shopping trips with their families, and so if you have a family of like four people or more, this suddenly becomes a big expense,鈥 Soberman said.

鈥楬ASSLE COSTS鈥

According to Soberman, in previous years there were larger price differences on many items in the U.S. and Canada.

鈥淭here鈥檚 been a lot more equalization,鈥 he said. 鈥淎nd part of that has been caused by online shopping.鈥

However, Soberman said some items, such as flat screen televisions or appliances, may still be significantly less expensive in the U.S.

Soberman said while some people might still be willing to cross the border to buy those items, the majority of cross-border shoppers are people who visit outlet malls, Walmart or Target and who aren鈥檛 going to spend large sums of money.

He said for most people who fall into that category, the money they might save on buying items in the U.S. might not be worth paying for the $100-$200 PCR test.

Soberman said the government has created a 鈥渉uge hassle cost鈥 for cross-border shopping by mandating PCR tests.

This includes the cost of the test, having the test performed and waiting for the result.

鈥淎ll of these things are significant in relation to the amount of saving that the average cross-border shopper is going to make,鈥 he said.

What鈥檚 more, Soberman said when hassle costs are significant, there鈥檚 a 鈥渘oticeable difference in the behaviours that people have.鈥

MAYORS CALL ON FEDS TO DROP PCR RULE

On Monday, several mayors and public officials of border communities in Canada and the U.S. held to implore the Canadian government to drop the mandatory PCR test rule for those returning to Canada.

The leaders cited several reasons the mandatory PCR tests should be scrapped, including preventing more needed travel and delaying family reunification.

Windsor, Ont. Mayor Drew Dilkens said the requirements were a 鈥渉ard-stop barrier for families to reunite except [the] wealthiest of Canadians.鈥

鈥淎nd that is unfair,鈥 he said.

Niagara Mayor Jim Diodati said in order to make the border 鈥渢ruly鈥 open, the government needs to remove the 鈥渟enseless PCR test, the molecular test,鈥 adding that it 鈥渄oes nothing to make things safer.鈥

New York Congressman Brian Higgins called the rule a 鈥渞edundant, unnecessary testing requirement.鈥

RAPID ANTIGEN TESTS

According to Soberman, there might be an increase in the number of people crossing the border to shop if the government decides to switch the requirement from a PCR test to an antigen test.

Antigen tests 鈥 commonly referred to as rapid tests 鈥 are more affordable, though access to them .

Asked by 麻豆影视 Channel on Monday if rapid antigen tests would be a suitable switch for travellers at the border, Dr. Kwadwo Kyeremanteng, an ICU and palliative care doctor at the Ottawa Hospital, said they are an 鈥渆xcellent and practical alternative,鈥 and also cheaper.

鈥淎nd to be frank, I think we probably underutilize them throughout this pandemic,鈥 he said.

Rapid antigen tests have not been as widely used in Canada, as they are not considered as sensitive to the novel coronavirus as PCR tests.

However, Kyeremanteng said the rapid antigen tests are a 鈥済reat measure鈥 because they tell you if you鈥檙e infectious within approximately 15 minutes, and if you鈥檙e likely to be transmitting the virus.

鈥淲hen we鈥檝e done the precautions like you can鈥檛 come across when you鈥檙e symptomatic, you have to be vaccinated -- double vaccinated-- and then you add on top of that the access to a test, which, in my mind a rapid test would be totally sensible, I think there鈥檚 probably a missed opportunity there,鈥 he said.

Speaking at a press conference last week, Canada鈥檚 Chief Public Health Officer, Dr. Theresa Tam, said the country鈥檚 policy on PCR test requirements at the Canadian border for travellers vaccinated against COVID-19 is being 鈥渁ctively looked at.鈥

鈥淛ust to reassure everybody, we are looking at that quite carefully,鈥 she said.

In an email to CTVNews.ca on Tuesday, the Public Health Agency of Canada (PHAC) said the federal government 鈥渞eviews border and travel measures on an ongoing basis,鈥 adding that the country鈥檚 border measures were changed to allow fully vaccinated foreign nationals into Canada on Sept. 7.

鈥淪ince then, testing and quarantine measures have not changed,鈥 the statement read.

PHAC said the border testing measures are 鈥渁 critical part of Canada鈥檚 COVID-19 surveillance strategy,鈥 which 鈥渉elp detect variants of concern and vaccine-escape variants.鈥

The agency cautioned that while cases are rare, 鈥渆ven fully vaccinated individuals can become infected with the virus that causes COVID-19.鈥

鈥淢olecular tests have a significantly high sensitivity for the detection of early-stage cases of COVID-19,鈥 the statement read. 鈥淔or this reason, a pre-arrival molecular test is required in order to reduce the greatest extent possible, the importation of cases, the risks of transmission in transit, and risks to Canada鈥檚 domestic health care system.鈥

UNCLEAR HOW MANY PEOPLE CROSSED BORDER SINCE REOPENING

It was not immediately clear how many people haven taken advantage of the loosened restrictions at the land border.

CTVNews.ca reached out to Canada Border Services Agency on Monday to ask how many Canadians have crossed the border to shop, but the agency said it cannot release data regarding reason or length of travel.

The  released by the agency did not include data for Monday.

Similarly, CTVNews.ca asked the United States Customs and Border Protection how many vehicles had crossed the land border on Monday since the restrictions had been lifted, and how many cited 鈥榮hopping鈥 as their reason for travel, but a spokesperson for the agency said that it is 鈥渘ot a datapoint we track.鈥 

-With files from CTV Windsor's Bob Bellacicco