The NRA was largely a dead letter even before the Supreme Court's decision. I agree with Brad DeLong's judgment that "a durable, comprehensively-implemented
NIRA would have been a disaster, but my understanding (from Ellis Hawley's
The New Deal and the Problem of Monopoly) was that it was neither comprehensively implemented nor durable. It was always spotty, and was a dead letter by the middle of 1934, a year before it was overturned in
Schechter Poultry."
https://www.bradford-delong.com/2007/01/the_new_deal_an.html
"A second key criticism of the Act is that it lacked support from the business community, and thus was doomed to failure.
[15] Business support for national planning and government intervention was very strong in 1933, but had collapsed by mid-1934.
[3][6][11] Many studies conclude, however, that business support for NIRA was never uniform. Larger, older businesses embraced the legislation while smaller, newer ones (more nimble in a highly competitive market and with less capital investment to lose if they failed) did not.
[11][68] This is a classic problem of cartels, and thus NIRA codes failed as small business abandoned the cartels.
[66][67] Studies of the steel, automobile manufacturing, lumber, textile, and rubber industries and the level and source of support for the NIRA tend to support this conclusion.
[69] Without the support of industry, the Act could never have performed as it was intended."
https://en.wikipedia.org/wiki/National_Industrial_Recovery_Act_of_1933 The NRA was probably misguided to the extent that it encouraged cartelization but "Others point out that the cartels created by the Act were inherently unstable (as all cartels are), and that the effect on prices was minimal because the codes collapsed so quickly.
[66][67]" Ibid. See Matthew B. Krepps, "Another Look at the Impact of the National Industrial Recovery Act on Cartel Formation and Maintenance Costs": "Alexander's (1994) finding that the National Recovery Administration's Codes of Fair Competition led to a change in the critical concentration level during the 1930s is questioned. No regime switch is detected when a common industry sample is employed. Also, when industries with and without codes are analyzed, codes appear to have no effect on price–cost margins during the period. This absence of effect is postulated to be a result of the unenforceability of trade practice provisions contained in many codes. The empirical results of this paper suggest that the existence of codes was not sufficient to enable industries to overcome cartel formation costs. Only easily enforceable trade practice provisions appear to have affected the structure–performance relation in the period following repeal of the National Industrial Recovery Act."
Abstract. Alexander's (1994) finding that the National Recovery Administration's Codes of Fair Competition led to a change in the critical concentration level during the 1930s is questioned. No regime switch is detected when a common industry sample is employed. Also, when industries with and...
www.mitpressjournals.org