economy · 2026-09-23

GDP's Black Box: Why 7.7% and 9.2% Both Look Right

The new GDP estimate shows manufacturing growing at 9.2% in real terms but 7.7% in rupees, a gap the double-deflation trick produces, yet nobody outside MoSPI can verify it because the underlying price data are unpublished.

How does double deflation work?

Double deflation measures a factory's real value added by adjusting its output and its raw-material inputs separately for price changes. Real GVA is real output minus real input costs. If input prices rise faster than output prices, the gap narrows, making real growth look stronger than nominal growth. That's why manufacturing real GVA grew 9.2% while nominal grew just 7.7%.

Why does this matter if real manufacturing is genuinely growing?

The gap matters because policy decisions are made on these numbers. The International Monetary Fund rated India's national accounts methodology a 'C' in 2025 (a low grade for statistical quality), citing the outdated base year and overuse of single deflation. The new series fixes some of that, but the unpublished price data means no outsider can replicate the 9.2% real growth figure. Our read: without transparent producer prices, every GDP debate becomes a credibility argument, not a growth argument.

Where do the price indexes double deflation relies on come from?

Double deflation needs two price series: one for the factory's output and one for its raw materials. The new Output Producer Price Index, with base 2022-23, provides the granular product-level data for both, replacing the old practice of using wholesale price indices. The IMF had previously flagged the lack of producer prices as a weakness that forced single deflation. MoSPI says the 'Sources and Methods' document, promised for September 2026, will lay out the full methodology and data sources behind these indexes.

If input prices jump, can a genuine factory still show healthy real profit growth?

Yes, and that is exactly what the double-deflation arithmetic produces. Real GVA is real output minus real inputs. When input prices rise faster than output prices, the nominal value of a factory's margins shrinks, yet its real GVA can still grow if physical output expands. In Q1 2026-27, manufacturing nominal GVA rose 7.7% but real GVA grew 9.2%, a gap the ministry attributes to textiles, basic metals, and rubber and plastics. The ministry notes advanced economies reliant on imported raw materials regularly see negative manufacturing deflators during supply shocks, so the pattern is not unusual. [e2][e12][e14]

Who actually pays when factories face rising input costs?

The factories themselves absorb the squeeze in nominal margins when input prices rise faster than output prices, even if real GVA still grows. In Q1 2026-27, manufacturing nominal GVA rose only 7.7% while real GVA grew 9.2%, meaning price gains failed to match cost increases across textiles, basic metals, rubber and plastics. The ministry says this pattern is common in economies reliant on imported raw materials during supply shocks. Our read: the pain shows up as thinner profits for manufacturers, not in the headline growth number.

Does this trick make the profit squeeze permanent?

No. The squeeze lasts only as long as input prices rise faster than output prices. MoSPI says the negative deflator reflects the relative movement of prices under double deflation, and OECD research shows advanced economies heavily dependent on imported raw materials regularly see such negative manufacturing deflators when supply chains fluctuate. When the price gap narrows, the deflator turns positive again. In Q1 2026-27, textiles, basic metals, and rubber and plastics had input price growth exceeding output price growth. Our read: the squeeze will persist while global commodity and energy prices stay elevated, which the IMF projects through 2026 amid West Asia tensions.

Could the double-deflation gap hide a real drop in factory output?

Yes, real GVA growth can stay positive even when physical output falls, if input prices rise enough. In Q1 2026-27, mining real GVA contracted 2.4% despite nominal GVA growing 22.3%, as crude oil prices jumped over 69%. The same arithmetic applies to manufacturing: real GVA is real output minus real inputs, so a factory can show positive real growth while producing less, if the price squeeze on inputs is severe enough. The ministry's own numbers confirm the mechanism cuts both ways.

What will actually change if MoSPI publishes the promised Sources and Methods document next month?

Publication would let outsiders rebuild the 9.2% real manufacturing growth figure from raw output and input price series, instead of taking the Ministry's word. That closes the credibility gap the IMF flagged when it rated India's accounts a C for the outdated 2011-12 base and excessive single deflation. MoSPI says it already detailed the methodology in February's Press Note and an annexure, so the September document is less about new method than about letting independent analysts verify the negative 1.5% deflator was arithmetic, not error.

Could the new GDP numbers be wrong?

Possibly. A 2023-24 manufacturing GVA cross-check using MoSPI's own Annual Survey of Industries and Annual Survey of Unincorporated Enterprises yields ₹27.4 lakh crore, against the official ₹38.6 lakh crore, a 40.9% gap. The official estimate leans on MCA-21, the corporate registry database (a government system for company filings). Whether the gap reflects genuine growth or double-counting will only be settled when MoSPI publishes the detailed 'Sources and Methods' document promised for September 2026.

Can the same trick make other sectors look healthier than they are?

Yes, whenever input costs rise faster than selling prices, real GVA can outpace nominal GVA, producing a negative deflator that looks like falling prices. MoSPI confirms the mechanism applies across manufacturing, citing textiles, basic metals, and rubber and plastics in Q1 2026-27. The same logic worked in reverse for mining: output prices jumped 22 per cent while volumes fell, so nominal GVA grew 22.3 per cent even as real GVA contracted 2.4 per cent. The method is not biased, but it amplifies the visibility of price shocks.

Why did manufacturing seem to shrink when it grew?

The apparent shrinkage is a difference in how growth is measured. Manufacturing's real GVA (adjusted for prices) grew by 9.2%, but its nominal GVA (in actual rupees) grew by only 7.7%. This happens when input prices rise faster than output prices, squeezing the margin. So the real output rose, but the value added in current prices grew less.

Why does this matter if real manufacturing is genuinely growing?

What breaks if the new GDP series is wrong?

Policy and market signals would misfire. The IMF already rated India's national accounts a 'C', citing stale price data and excessive single deflation, weaknesses the new series was meant to fix. If double deflation produces unreliable real growth figures, then headline growth, investment decisions and revenue projections all sit on a shaky base. Our read: the risk is not a fake number but a false sense of precision, which is harder to correct in public debate than an obvious lie. The September 2026 'Sources and Methods' document is the test that will show whether the new methodology holds up.

What is double deflation and why is it creating this gap?

Double deflation is a method that removes price changes separately from both what factories produce and the raw materials they consume, adjusting each with its own price index before. This is more accurate than the old way of using a single deflator, but it. To apply it, you need a Producer Price Index for both output and input. That's precisely what's missing: MoSPI relies on the new PPI for manufacturing, yet the underlying data is not publicly released, so no outsider can verify the 9.2% real growth figure.

What caused that gap in prices between inputs and outputs just now?

MoSPI points to a global supply-side shock. In Q1 2026-27, crude petroleum and natural gas prices jumped 69.5%, 72.2% and 33.7% across April, May and June, and metal ore prices rose over 23% each month. When such input costs climb faster than what factories charge for their goods, double deflation turns that margin squeeze into a negative GVA deflator, and real growth can outpace nominal growth. MoSPI notes advanced economies see this regularly during energy and raw material shocks.

Could this method overstate growth in other sectors too?

Yes, wherever double deflation applies to activities with volatile inputs. The method is currently used for manufacturing, where Q1 real growth of 9.2% outpaced nominal growth of 7.7% because input prices, like crude petroleum and natural gas, rose up to 72.2% in a single month. MoSPI notes that OECD research shows advanced economies regularly see negative manufacturing deflators during energy and raw material shocks. Our read: the same error risk now shifts to mining, where real GVA fell 2.4% while nominal GVA rose 22.3%.

Does this method also distort growth outside manufacturing?

Yes, wherever input and output prices diverge sharply. In Q1 2026-27, mining and quarrying real GVA contracted 2.4% while nominal GVA grew 22.3%, because crude petroleum and natural gas prices rose up to 72.2% in a single month. The PPI for mining recorded inflation above 20% in all three months,but the volume of extraction fell, as measured by the negative IIP. Double deflation is not yet applied to mining, so its nominal and real GVA move oppositely, producing a similar credibility puzzle to manufacturing's negative deflator. Our read: the same input-price shock created opposite anomalies in both sectors, and the methodology debate will keep resurfacing with every commodity spike.

Why does this only show up in manufacturing and not the rest of the economy?

Double deflation is only applied to manufacturing in the new series, while other sectors are still measured the old way. MoSPI states the new PPI made double deflation feasible for manufacturing, because it provides the separate output and input price indices the method requires. Mining, for instance, still uses a single volume indicator, the IIP, for constant prices. Our read: the uneven adoption is why the negative deflator appears in manufacturing alone, and other sectors will face the same credibility questions the day the method spreads to them.

Could the new GDP numbers be wrong?

Who loses if the manufacturing growth figure is wrong?

The worker and the taxpayer. If the 9.2% real manufacturing growth is overstated, then credit, subsidies and PLI incentives flow on false premises, while wages and employment in the sector are read as robust when they are not. The independent cross-check using ASI and ASUSE data produces a manufacturing GVA nearly 41% lower than the official figure, which relies heavily on MCA-21 corporate filings. Our read: the corporate-filing bias inflates the organised sector's weight, making the informal factory floor, where most Indians work, disappear from the growth story.

Source: outlookbusiness.com