In this paper I calculate TFP ratios for a sample of Canadian manufacturers relative to their American counterparts on an annual basis throughout most of the twentieth century. The data used to calculate these ratios are drawn from both industry-level and firm-level statistical sources. I find that, in contrast to the relative labour productivity evidence in the literature, when TFP is used as the measuring stick, there is virtually no evidence of consistent and substantial relative technical inefficiency on behalf of the Canadian manufacturers represented in my sample. JEL Classification: D24, N60.