I'd be curious to see if there's a significant drop in the number of people shopping at Trader Joe's and Target,...

I'd be curious to see if there's a significant drop in the number of people shopping at Trader Joe's and Target, among others, near the borders. Those ought to be early and noticeable if this happens.

https://www.reuters.com/article/us-usa-canada-trade/at-odds-with-trump-over-trade-canadians-say-they-will-avoid-u-s-goods-poll-idUSKBN1JB2X7
https://www.reuters.com/article/us-usa-canada-trade/at-odds-with-trump-over-trade-canadians-say-they-will-avoid-u-s-goods-poll-idUSKBN1JB2X7