1. Why are they core indicators of financial management?
CPI, domestic PPI and inflation expectations are a common input to a wide range of corporate decisions: selling prices, wage increases, inventory policy, borrowing costs, the discount rate on investment and the cash budget. For the CFO, therefore, the salient question is not “what is the inflation rate?” but “which prices are changing, and how fast?”. Read together, CPI, domestic PPI and inflation expectations help separate the firm’s nominal growth from its real performance and support more realistic budgets.
2. CPI represents selling prices, wages and the demand side
CPI measures the change in prices of goods and services purchased by households for final consumption. Its most important function in financial management is to show the price environment faced by the firm’s customers and the change in purchasing power. A high CPI can make it easier for nominal sales to grow; that growth need not, however, mean an increase in real volume. If, for example, sales rise by 35% while the relevant market’s price level rises by 30%, the firm’s real growth is far smaller than the nominal figure suggests.
CPI is also a reference for wage negotiations, rent and service contracts, administrative expenses and overhead budgets. The CFO should therefore not stop at the annual rate; monthly trends, main expenditure groups and core inflation indicators should also be monitored. Inflation that becomes sticky in services may signal that personnel and outsourced-service costs will remain high for longer than expected. In firms oriented to consumer demand, a high CPI together with a loss of real income can raise sales-volume and collection risk.
3. Domestic PPI shows cost pressure and margin risk earlier
Domestic PPI measures the change in producer prices of goods produced and sold in the domestic market. It is therefore closer to the cost side, especially for manufacturing, energy, mining and firms intensive in industrial inputs. In periods when domestic PPI rises faster than CPI, the producer’s cost or exit-price pressure may not yet have fully passed through to consumer prices. That gap can squeeze gross margins in firms that cannot update selling prices at the same speed.
Domestic PPI is not, however, “cost inflation” for any given company. The energy, steel, foreign-currency and labour weights of a metal-processing firm differ from the cost basket of a service company. The CFO should therefore compare domestic PPI with the firm’s own purchase-price index. The most useful practice is to construct a weighted “company cost index” for the main inputs. Official producer inflation can then be judged by how far it represents the firm’s true cost structure.
4. Inflation expectations govern forward-looking decisions
Outturn CPI and domestic PPI show price change that has already occurred; inflation expectations are critical for future pricing and financing behaviour. In Türkiye the CBRT tracks 12-month-ahead consumer-inflation expectations of market participants, the real sector and households separately. These groups’ expectations can diverge markedly. Market expectations affect interest and discount rates more quickly, while real-sector expectations give more direct information on firms’ pricing, wage, inventory and order behaviour.
For the CFO, the direction and dispersion of expectations matter as much as their level. In an environment where expectations rise or deteriorate, higher wage demands, shorter price-validity periods, earlier supplier increases and a larger working-capital need may appear. A decline in expectations suggests that the pace of price increases may slow and that nominal turnover growth will not continue automatically. Setting next year’s budget merely by carrying forward the last twelve months of inflation can therefore be a serious error.
5. How should they feed financial decisions?
In pricing, the CFO should look not only at whether selling prices have been raised in line with CPI, but at how much of the rise in input costs can be passed on to customers. If domestic PPI or the company cost index is rising faster than selling prices, ways of passing through prices without losing volume should be sought. In long-term contracts, appropriate indexation, repricing clauses or cost-sharing mechanisms may be considered instead of a fixed price.
In budget and cash planning it is sounder to use three scenarios: a base case, a high-inflation case and a rapid-disinflation case. The high-inflation scenario enlarges not only revenues but also inventory investment, receivables, wages, tax and financing expense. The view that “if inflation is high, turnover will also be high” is therefore misleading; what matters is how much of the higher turnover converts into cash and real profit.
In borrowing decisions, expected inflation and the nominal interest rate should be read together. If rates are expected to fall, moving at once into long-term fixed-rate debt is not always advantageous; conversely, when inflation expectations deteriorate and interest-rate risk rises, the share of floating-rate debt may be limited. In investment appraisal, nominal cash flows should be discounted at a nominal rate and real cash flows at a real rate. Inflation feeds through to revenue, cost, working-capital and tax items at different speeds.
6. Inflation should be monitored as a decision system
CPI, domestic PPI and inflation expectations give different but complementary information for financial management. CPI shows the general rise in prices faced by consumers and thus speaks to customers’ purchasing power, the firm’s ability to raise selling prices, and the path of some overheads such as wages and rent. Domestic PPI reflects the change in producer prices and helps identify the direction of cost pressure from raw materials, intermediates, energy and other production inputs. Inflation expectations set out the market’s view of how prices, wages and interest rates may evolve. The three indicators should therefore be assessed together.
Financial risk can increase especially when the indicators move in different directions. If production costs rise rapidly while consumer demand weakens, the firm may be unable to pass cost increases through to selling prices to the same extent. Sales may then grow in nominal terms while the gross margin narrows. Persistently high inflation expectations may lead suppliers to demand higher prices and shorter terms, raise employees’ wage-increase expectations and keep financing costs high. The working capital and cash needed to sustain the same activity volume may therefore increase.
CPI, domestic PPI and inflation expectations should be read together with the firm’s selling prices, unit costs, gross margin, inventory days, collection period, interest costs and budget outturns. If, for example, domestic PPI rises by 30% while the cost of the firm’s main inputs rises by 45%, the cost pressure the firm faces is well above general producer inflation. Likewise, if CPI is high but the firm cannot raise selling prices enough, pricing power is weakening or demand is sensitive to price increases.
The soundest approach is to compare official inflation indicators with the firm’s own selling-price and cost indices, and not to tie forward-looking decisions to a single inflation forecast. The CFO should construct low, base and high inflation scenarios and try to see in advance the effect of each on sales, costs, margins, working-capital need, interest expense and cash flows. Inflation then ceases to be a statistic of how much prices rose in the past and becomes an active financial-management tool guiding pricing, budgeting, financing, investment and cash management.
A current illustration (August 2026)
Outturn inflation and inflation expectations do not mean the same thing. That annual CPI was 31.75% in July 2026 shows how much consumer prices rose over the previous twelve months. By contrast, expectations of 23.69% twelve months ahead and 18.03% twenty-four months ahead indicate that market participants foresee a gradual slowing of inflation. The CFO should therefore not carry the outturn inflation rate directly into budget and valuation models as the future rate.
In financial planning, selling prices, wages, raw-material and energy costs, rent, interest rates and the working-capital need are not tied to the same inflation rate. Each item should be forecast on its own dynamics. Especially when costs rise faster than selling prices, profit margins may narrow and the cash need may increase despite nominal sales growth.
The sounder approach is therefore to treat outturn inflation as an indicator of the past and expectations as an input to forward-looking decisions. The CFO should construct base, optimistic and pessimistic scenarios and analyse together the effects of inflation on sales, costs, interest expense, working capital and cash flows.
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